期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 37, 页码 31384-31393出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10253
关键词
carbon electrodes; PEI modification; stability; energy level alignment; interfacial charge transfer
资金
- National Natural Science Foundation of China (NSFC) [51772166, 51702038, 51727805, 51672152]
- Projects of International Cooperation and exchanges (NSFC) [51561145007]
- National Energy Novel Materials Center [NENMC-II-1705]
- Ministry of Science & Technology, P.R.China: Sino-Italy International Cooperation on Innovation [2016YFE0104000]
Inverted perovskite solar cells (PSCs) have been becoming more and more attractive, owing to their easy-fabrication and suppressed hysteresis, while the ion diffusion between metallic electrode and perovskite layer limit the long-term stability of devices. In this work, we employed a novel polyethylenimine (PEI) modified cross-stacked superaligned carbon nanotube (CSCNT) film in the inverted planar PSCs configurated FTO/NiOx/methylammonium lead tri-iodide (MAPbI(3))/6, 6-phenyl C61-butyric acid methyl ester (PCBM)/CSCNT:PEI. By modifying CSCNT with a certain concentration of PEI (0.5 wt %), suitable energy level alignment and promoted interfacial charge transfer have been achieved, leading to a significant enhancement in the photovoltaic performance. As a result, a champion power conversion efficiency (PCE) of similar to 11% was obtained with a V-oc of 0.95 V, a J(sc) of 18.7 mA cm(-2), a FF of 0.61 as well as negligible hysteresis. Moreover, CSCNT:PEI based inverted PSCs show superior durability in comparison to the standard silver based devices, remaining over 85% of the initial PCE after 500 h aging under various conditions, including long-term air exposure, thermal, and humid treatment. This work opens up a new avenue of facile modified carbon electrodes for highly stable and hysteresis suppressed PSCs.
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