Enhanced Efficiency and Excellent Thermostability in Organic Photovoltaics via Ternary Strategy with Twisted Conjugated Compound. Issue 49 (15th October 2021)

• Record Type: Journal Article
• Authors: Zhang, Lifu; Zhao, Heng; Hu, Ming; Wang, Xinkang; Hu, Lei; Mao, Houdong; Yuan, Zhongyi; Ma, Wei; Chen, Yiwang
• Is Part Of: Small. Volume 17:Issue 49(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-10-15
• Subjects: morphology -- organic photovoltaics -- ternary strategy -- thermal stability -- twisted benzodiperylenediimides; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202103537
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: The thermal stability of high‐efficiency organic photovoltaics (OPVs) is critical to the manufacturing of this technology. Therefore, targeted strategies and approaches shall be developed to improve efficiency and stability, simultaneously. Herein, a seleno twisted benzodiperylenediimides (TBD‐PDI‐Se) acceptor‐doping strategy is taken advantage of to demonstrate the ternary bulk heterojunction OPVs with excellent stability, achieving outstanding power conversion efficiency of 14.43% and 17.25% based on PM6:IT‐4F and PM6:Y6 ternary blend devices, respectively, which are superior to the corresponding binary devices. As evidenced by the active layer morphology, exciton dynamic study and the characterizations of the enabled device, the ternary blend device keeps nearly 90% original efficiency ( t = 1000 h) under continuous constant heating at 140 °C. Furthermore, the application of acceptor as the third component in PBDB‐T:ITIC, J71:ITIC, and PBDB‐T:PC71 BM systems is also verified, proving the good universality of acceptor‐doping ternary strategy. Abstract : The TBD‐PDI‐C11‐Se (C11‐Se) is introduced as a multifunctional component that can improve the crystallinity of PM6 and suppresses the aggregation of the acceptor. High efficiency of 17.25% is achieved based on PM6:Y6 ternary device. Besides, C11‐Se as a third component to improve both the efficiency and thermal stability simultaneously in the other three systems is reported.