In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 9 ( 2023), p. 4808-4817
Abstract:
Organic solar cells (OSCs) are potential power sources for wearable electronic devices. However, the mechanical stretchability of active materials is not yet sufficient; one of the main reasons is the high rigidity of polymer donors (P D s) and the resultant excessive crystalline structures, which makes the active layer mechanically-fragile. In this study, we develop a series of PM6-based terpolymers (PM6-B X ; X = 10–30, X indicates the mole percentage of the third component) in which a bulky electro-active third component, 7,8-bis(5-hexylthiophen-2-yl)-11 H -benzo[4,5] imidazo[2,1- a ]isoindol-11-one (BID), is introduced to reduce the tightness of their molecular packing. As a result, the neat P D film with 10 mol% BID (PM6-B10) exhibits significantly improved mechanical ductility ( i.e. , average crack onset strain (COS avg ) of 23.8%) compared to that of the neat PM6 film (COS avg = 14.9%) without a BID unit. In addition, in terms of a blend film, the well-intermixed domains of PM6-B10 and a small molecule acceptor afford OSCs with a high power conversion efficiency (PCE) of 17.2% and mechanical stretchability (COS avg = 11.4%), outperforming the PM6 counterpart (PCE = 15.8%, COS avg = 2.0%). This study suggests important guidelines for the design of efficient P D s for high-performance, stretchable OSCs.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
Permalink