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- Title
A Mixed PC<sub>61</sub>BM‐COi8DFIC Based Electron Transport Material for Inverted High‐performance Perovskite Solar Cells.
- Authors
Ali, Jazib; Li, Yu; Song, Jingnan; Zhang, Ming; Zhou, Guanqing; Xu, Jinqiu; Zhu, Lei; Hussain, Ahmad; Khan, Firoz; Liu, Feng
- Abstract
This study reports a blend of [6, 6]‐phenyl‐C61‐butyric acid methyl ester (PC61BM) and COi8DFIC non‐fullerene acceptor (NFA) as an electron transport layer (ETL) in perovskite solar cells (PSCs). This mixed small‐molecule ETL showed good inter‐molecule mixing, reduced intermolecular distances and decent morphology, resulting in excellent charge carrier transport properties. Morever, charge carrier extraction and transport at the perovskite/ETL interface was optimized by reducing surface traps and defects due to the passivation ability of various terminal groups from the COi8DFIC molecule. A high power conversion efficiency (PCE) of 19.12 % was achieved by taking advantage of benefits from both molecules, showing much better performance than the invidual PC61BM or COi8DFIC (7.13% for using the NFA only). Moreover, the storage and ambient stabilities of the mixed ETL‐based PSCs increased dramatically compared to control devices.
- Subjects
SOLAR cells; PEROVSKITE; METHYL formate; CHARGE carriers; SURFACE defects; ELECTRON transport; ELECTRON mobility
- Publication
ChemNanoMat, 2023, Vol 9, Issue 1, p1
- ISSN
2199-692X
- Publication type
Article
- DOI
10.1002/cnma.202200377