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  • 1
    Online Resource
    Online Resource
    Non-fullerene electron acceptors with benzotrithiophene with π-extension terminal groups for the development of high-efficiency organic solar cells
    Royal Society of Chemistry (RSC) ; 2021
    In:  Journal of Materials Chemistry C Vol. 9, No. 39 ( 2021), p. 13896-13903
    Details
    In: Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Vol. 9, No. 39 ( 2021), p. 13896-13903
    Abstract: Developing novel building blocks is essentially important to construct high-performance non-fullerene electron acceptors (NFEAs). Benzotrithiophene (BTT) as an electron-donating block has been widely applied in active materials to obtain high-performance organic field-effect transistors. However, its application in NFEAs for organic solar cells (OSCs) has rarely been reported so far. In this work, two NFEAs, BTTBo-4F and BTTBo-4FN, were synthesized by combining BTT as a central unit with two terminal groups. Compared with BTTBo-4F, BTTBo-4FN exhibited stronger absorption, a narrower optical bandgap, and more ordered face-to-face π-stacking. As a consequence, the BTTBo-4FN-based OSCs achieved a higher power conversion efficiency (PCE) of 11.60%, whereas the BTTBo-4F-based OSCs achieved a moderate PCE of 8.27%. Further investigation revealed that the BTTBo-4FN-based OSCs exhibited a more efficient charge transfer, lower charge recombination, higher charge mobility, and better phase morphology than the latter. Our findings indicate that combining BTT as a central unit with π-extension terminal groups is a promising strategy to construct high-performance NFEAs.
    Type of Medium: Online Resource
    ISSN: 2050-7526 , 2050-7534
    URL: Article
    DOI: 10.1039/D1TC03259C
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2021
    detail.hit.zdb_id: 2702245-6
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  • 2
    Online Resource
    Online Resource
    Donor–Acceptor Copolymers with Rationally Regulated Side Chain Orientation for Polymer Solar Cells Processed by Non-Halogenated Solvent
    Georg Thieme Verlag KG ; 2022
    In:  Organic Materials Vol. 4, No. 02 ( 2022-05), p. 18-27
    Details
    In: Organic Materials, Georg Thieme Verlag KG, Vol. 4, No. 02 ( 2022-05), p. 18-27
    Abstract: A donor–acceptor (D-A) conjugated polymer PBTFO-T-1 consisting of 2,1,3-benzothiadiazole (BT) as A unit and thiophene (T) as D unit was facilely obtained by a straightforward three-step reaction. The BT unit is attached with a fluorine atom and an alkoxy chain to simultaneously endow the polymer with a deep HOMO energy level and desirable solubility. The alkoxyl chain orientation on the BT unit has been regulated and the polymer PBTFO-T-2 with regio-regularly oriented side chains was also developed to investigate the impact of the alkoxyl chain orientation on their optoelectronic properties. The PBTFO-T-1:Y6-BO polymer solar cells (PSCs) were processed with a non-halogenated solvent and achieved an optimized power conversion efficiency of 14.16%, significantly higher than 9.39% of the PBTFO-T-2:Y6-BO counterpart. It has been demonstrated that the PBTFO-T-1:Y6-BO film exhibits higher and more balanced charge transportation and superior film morphology, resulting in higher exciton generation and dissociation, less recombination and eventually the higher short-circuit current density (J sc) and fill factor. This study provides a possible strategy to develop polymer donors with low cost for future commercial applications of PSCs and gives some insights into regulating optoelectronic properties of polymer donors via rationally modifying their side chain orientation.
    Type of Medium: Online Resource
    ISSN: 2625-1825
    URL: Article
    DOI: 10.1055/a-1833-8668
    Language: English
    Publisher: Georg Thieme Verlag KG
    Publication Date: 2022
    detail.hit.zdb_id: 2933949-2
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  • 3
    Online Resource
    Online Resource
    Tandem Organic Solar Cells with 18.7% Efficiency Enabled by Suppressing the Charge Recombination in Front Sub‐Cell
    Wiley ; 2021
    In:  Advanced Functional Materials Vol. 31, No. 29 ( 2021-07)
    Details
    In: Advanced Functional Materials, Wiley, Vol. 31, No. 29 ( 2021-07)
    Abstract: The maximum photocurrent in tandem organic solar cells (TOSCs) is often obtained by increasing the thicknesses of sub‐cells, which leads to recombination enhancement of such devices and compromises their power conversion efficiency (PCE). In this work, an efficient interconnecting layer (ICL) is developed, with the structure ZnO NPs:PEI/PEI/PEDOT:PSS, which enables TOSCs with very good reproducibility. Then, it is discovered that the optimal thickness of the front sub‐cell in such TOSCs can be reduced by increasing the proportion of a non‐fullerene acceptor in the active layer. The non‐fullerene acceptor used in this work has a much larger absorption coefficient than the donor in the front sub‐cell, and the absorption reduction of donor can be well complemented by that of the acceptor when increasing the acceptor proportion, thus leading to a significant overall absorption enhancement even with a thinner film. As a result, the optimal thickness of the front sub‐cell is reduced and its charge recombination is suppressed. Ultimately, the use of this ICL combined with fine‐turning of the composition in the front sub‐cell enables an efficient TOSC with a very high fill factor of 78% and an excellent PCE of 18.71% (certified by an accredited institute to be 18.09%) to be obtained.
    Type of Medium: Online Resource
    ISSN: 1616-301X , 1616-3028
    URL: Issue
    URL: Article
    DOI: 10.1002/adfm.v31.29
    DOI: 10.1002/adfm.202103283
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2029061-5
    detail.hit.zdb_id: 2039420-2
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    All-Polymer Solar Cells and Photodetectors with Improved Stability Enabled by Terpolymers Containing Antioxidant Side Chains
    Springer Science and Business Media LLC ; 2023
    In:  Nano-Micro Letters Vol. 15, No. 1 ( 2023-12)
    Details
    In: Nano-Micro Letters, Springer Science and Business Media LLC, Vol. 15, No. 1 ( 2023-12)
    Abstract: It is of vital importance to improve the long-term and photostability of organic photovoltaics, including organic solar cells (OSCs) and organic photodetectors (OPDs), for their ultimate industrialization. Herein, two series of terpolymers featuring with an antioxidant butylated hydroxytoluene (BHT)-terminated side chain, PTzBI-EHp-BTBHTx and N2200-BTBHTx ( x  = 0.05, 0.1, 0.2), are designed and synthesized. It was found that incorporating appropriate ratio of benzothiadiazole (BT) with BHT side chains on the conjugated backbone would induce negligible effect on the molecular weight, absorption spectra and energy levels of polymers, however, which would obviously enhance the photostability of these polymers. Consequently, all-polymer solar cells (all-PSCs) and photodetectors were fabricated, and the all-PSC based on PTzBI-EHp-BTBHT0.05: N2200 realized an optimal power conversion efficiency (PCE) approaching ~ 10%, outperforming the device based on pristine PTzBI-EHp: N2200. Impressively, the all-PSCs based on BHT-featuring terpolymers displayed alleviated PCEs degradation under continuous irradiation for 300 h due to the improved morphological and photostability of active layers. The OPDs based on BHT-featuring terpolymers achieved a lower dark current at − 0.1 bias, which could be stabilized even after irradiation over 400 h. This study provides a feasible approach to develop terpolymers with antioxidant efficacy for improving the lifetime of OSCs and OPDs.
    Type of Medium: Online Resource
    ISSN: 2311-6706 , 2150-5551
    URL: Article
    DOI: 10.1007/s40820-023-01114-5
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2642093-4
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  • 5
    Online Resource
    Online Resource
    Random copolymerization strategy for non-halogenated solvent-processed all-polymer solar cells with a high efficiency of over 17%
    Royal Society of Chemistry (RSC) ; 2022
    In:  Energy & Environmental Science Vol. 15, No. 11 ( 2022), p. 4561-4571
    Details
    In: Energy & Environmental Science, Royal Society of Chemistry (RSC), Vol. 15, No. 11 ( 2022), p. 4561-4571
    Abstract: With the innovation of new materials, the power conversion efficiencies (PCEs) of all-polymer solar cells (all-PSCs) have been boosted to over 17%. However, most of them are processed with toxic halogenated solvents instead of non-halogenated solvents, which mainly stems from the difficulty of implementing a favorable active layer morphology via the latter. Here, we report a donor polymer named JD40-BDD20 by using a random copolymerization strategy for non-halogenated solvent-processed all-PSCs. The incorporation of the 1,3-bis(4-(2-ethylhexyl)thiophen-2-yl)-5,7-bis(2-alkyl)benzo[1,2- c :4,5- c ′]dithiophene-4,8-dione (BDD) unit endows JD40-BDD20 with improved solubility, suitable pre-aggregation and crystallinity, and superior miscibility with PJTVT, compared to JD40. Consequently, a favorable morphology with a suitable domain size was achieved for a JD40-BDD20:PJTVT device processed with o -xylene ( o -XY), contributing to improved exciton dissociation, balanced charge transport, enhanced charge extraction, and decreased charge recombination and energy loss (Δ E loss ). Eventually, a prominent efficiency of 16.35% was achieved for the JD40-BDD20:PJTVT device, which was processed without annealing. In particular, when choosing PA-5 as an acceptor, the PCE was boosted to 17.21%. This work confirms that random copolymerization can be a very useful strategy by which to synchronously regulate the solubility and crystallinity of the polymer. It also demonstrates that JD40-BDD20 is promising to become the “workhorse” donor for the field of all-PSCs, and provides a promising avenue by which to achieve an optimal domain size in all-PSCs processed using non-halogenated solvent.
    Type of Medium: Online Resource
    ISSN: 1754-5692 , 1754-5706
    URL: Article
    DOI: 10.1039/D2EE01996E
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2022
    detail.hit.zdb_id: 2439879-2
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  • 6
    Online Resource
    Online Resource
    Simultaneous improvement of efficiency and stability of inverted organic solar cell via composite hole transport layer
    Royal Society of Chemistry (RSC) ; 2022
    In:  Journal of Materials Chemistry A Vol. 10, No. 45 ( 2022), p. 23973-23981
    Details
    In: Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 45 ( 2022), p. 23973-23981
    Abstract: It is generally believed that the inverted structure is more beneficial for constructing highly stable organic solar cells (OSCs), but the power conversion efficiency (PCE) of current inverted OSCs lags significantly behind that of conventional-structure ones. Herein, a novel composite hole transport layer (HTL) is developed by combining a small molecule, [2-(9 H -carbazol-9-yl)ethyl]phosphonic acid (2PACz) with molybdenum oxide (MoO 3 ) to simultaneously optimize efficiency and stability. Benefiting from the favorable surface morphology, enhanced built-in potential, and suppressed recombination of this composite HTL, an impressive PCE enhancement from 17.46% for the control device based on MoO 3 alone to 18.49% for the optimal device with the composite HTL is achieved with the PM6:L8-BO-F:Y6-BO active layer, which represents the best PCE for inverted OSCs to date. In addition to achieving a high PCE, adopting this 2PACz/MoO 3 HTL also improves the device stability. The unencapsulated device maintains 96.4% of its initial PCE after being stored in nitrogen for 8000 h, while that of the MoO 3 -based device degrades to 86.3%. Additionally, after 220 h of continuous illumination under a white light emitting diode light source at 100 mW cm −2 , the 2PACz/MoO 3 -based device maintains 75.5% of its initial PCE value, while that of the MoO 3 -based device degrades to 65.5%. These results demonstrate the superiority of this composite HTL in simultaneously enhancing the efficiency and stability of the inverted device and providing an efficient strategy for fabricating high-efficiency inverted OSCs.
    Type of Medium: Online Resource
    ISSN: 2050-7488 , 2050-7496
    URL: Article
    DOI: 10.1039/D2TA07022G
    Language: English
    Publisher: Royal Society of Chemistry (RSC)
    Publication Date: 2022
    detail.hit.zdb_id: 2702232-8
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  • 7
    Online Resource
    Online Resource
    Fine‐Tuning Batch Factors of Polymer Acceptors Enables a Binary All‐Polymer Solar Cell with High Efficiency of 16.11%
    Wiley ; 2022
    In:  Advanced Energy Materials Vol. 12, No. 3 ( 2022-01)
    Details
    In: Advanced Energy Materials, Wiley, Vol. 12, No. 3 ( 2022-01)
    Abstract: Random conjugated polymers, such as typical polymerized small molecular acceptors (PSMAs), concurrently suffer from the dual batch factors of molecular weights (MWs) and regioregularity, which seriously interfere with the study of the relationship between batch factors and polymer properties. Here, four isomer‐free PSMAs, PA‐5 and three members of a PA‐6 series with low (L), medium (M), and high (H) MWs, in which 5 and 6 define linkage position throughout conjugated backbone, are designed and synthesized to clearly investigate polymer batch effects. These studies reveal that PA‐6‐L and PA‐6‐M have ignorable batch differences within deviations, which deliver comparable maximum efficiencies of 14.81% and 14.99%, respectively. The PA‐6‐H based cell is processed from chlorobenzene with its high boiling point, due to the limited solubility in other common solvents, leading to large‐size phase separation during prolonged film drying process, and thereby inferior performance. In contrast, PA‐5 possesses diverse absorption characteristics, and ordered crystallization, which prompts higher short‐circuit current density and fill factor in the cell. As a result, the corresponding device realizes a photovoltaic performance of 16.11%, which is one of the best binary all‐polymer solar cells in the reported literature to date. This study provides a new insight into complicated batch effects of PSMAs on device performance while avoiding cross‐talk between them.
    Type of Medium: Online Resource
    ISSN: 1614-6832 , 1614-6840
    URL: Issue
    URL: Article
    DOI: 10.1002/aenm.v12.3
    DOI: 10.1002/aenm.202103193
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2594556-7
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  • 8
    Online Resource
    Online Resource
    Highly efficient organic solar cells with improved stability enabled by ternary copolymers with antioxidant side chains
    IOP Publishing ; 2023
    In:  Journal of Semiconductors Vol. 44, No. 8 ( 2023-08-01), p. 082202-
    Details
    In: Journal of Semiconductors, IOP Publishing, Vol. 44, No. 8 ( 2023-08-01), p. 082202-
    Abstract: The stability of organic solar cells (OSCs) remains a major concern for their ultimate industrialization due to the photo, oxygen, and water susceptibility of organic photoactive materials. Usually, antioxidant additives are blended as radical scavengers into the active layer. However, it will induce the intrinsic morphology instability and adversely affect the efficiency and long-term stability. Herein, the antioxidant dibutylhydroxytoluene (BHT) group has been covalently linked onto the side chain of benzothiadiazole (BT) unit, and a series of ternary copolymers D18-Cl-BTBHTx (x = 0, 0.05, 0.1, 0.2) with varied ratio of BHT-containing side chains have been synthesized. It was found that the introduction of BHT side chains would have a negligible effect on the photophysical properties and electronic levels, and the D18-Cl-BTBHT0.05: Y6-based OSC achieved the highest power conversion efficiency (PCE) of 17.6%, which is higher than those based active layer blended with BHT additives. More importantly, the unencapsulated device based on D18-Cl-BTBHTx (x = 0.05, 0.1, 0.2) retained approximately 50% of the initial PCE over 30 hours operation under ambient conditions, significantly outperforming the control device based on D18-Cl (90% degradation in PCE after 30 h). This work provides a new structural design strategy of copolymers for OSCs with simultaneously improved efficiency and stability.
    Type of Medium: Online Resource
    ISSN: 1674-4926 , 2058-6140
    URL: Article
    DOI: 10.1088/1674-4926/44/8/082202
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2484682-X
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