In:
Nano-Micro Letters, Springer Science and Business Media LLC, Vol. 12, No. 1 ( 2020-12)
Abstract:
A novel interface design is proposed for carbon-based, all-inorganic CsPbIBr 2 perovskite solar cells (PSCs) by introducing interfacial voids between TiO 2 electron transport layer and CsPbIBr 2 absorber. Compared with the general interfacial engineering strategies, this design exempts any extra modification layer in final PSC. More importantly, the interfacial voids produced by thermal decomposition of 2-phenylethylammonium iodide trigger three beneficial effects. First, they promote the light scattering in CsPbIBr 2 film and thereby boost absorption ability of the resulting CsPbIBr 2 PSCs. Second, they suppress recombination of charge carriers and thus reduce dark saturation current density ( J 0 ) of the PSCs. Third, interfacial voids enlarge built-in potential ( V bi ) of the PSCs, awarding increased driving force for dissociating photo-generated charge carriers. Consequently, the PSC yields the optimized efficiency of 10.20% coupled with an open-circuit voltage ( V oc ) of 1.338 V. The V oc achieved herein represents the best value among CsPbIBr 2 PSCs reported earlier. Meanwhile, the non-encapsulated PSCs exhibit an excellent stability against light, thermal, and humidity stresses, since it remains ~ 97% or ~ 94% of its initial efficiency after being heated at 85 °C for 12 h or stored in ambient atmosphere with relative humidity of 30–40% for 60 days, respectively.
Type of Medium:
Online Resource
ISSN:
2311-6706
,
2150-5551
DOI:
10.1007/s40820-020-00425-1
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2020
detail.hit.zdb_id:
2642093-4
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