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Organic Electronic Devices
A Simple Perylene Derivative as a Solution-Processable Cathode Interlayer for Perovskite Solar Cells with Enhanced Efficiency and Stability Chen Wang, Ping Liu, Huanxin Ju, Quan Yuan, Dongwei Han, Yu Wang, Dong-Ying Zhou, and Lai Feng ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.8b02256 • Publication Date (Web): 23 Apr 2018 Downloaded from http://pubs.acs.org on April 23, 2018
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ACS Applied Materials & Interfaces
A Simple Perylene Derivative as a Solution−Processable Cathode Interlayer for Perovskite Solar Cells with Enhanced Efficiency and Stability Chen Wang,†,‡ Ping Liu,†,‡ Huanxin Ju,§ Quan Yuan,†,‡ Dongwei Han,†,‡ Yu Wang,†,‡ Dong−Ying Zhou,*,†,‡ Lai Feng,*,†,‡ †
Soochow Institute for Energy and Materials InnovationS (SIEMIS), College of Physics,
Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China ‡
Jiangsu Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies,
Soochow University, Suzhou 215006, China §
National Synchrotron Radiation Laboratory, University of Science and Technology of China,
Hefei, Anhui 230029, China
KEYWORDS: p−i−n perovskite solar cell, interface engineering, cathode interlayer, degradation, interfacial recombination
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ABSTRACT
A simple alcohol−soluble perylene derivative (i.e., tetramethyl ammonium salt of perylene−3,4,9,10−tetracarboxylic acid; TMA−PTC) was prepared and applied as a cathode interlayer (CIL) to modify the PC61BM/Ag interface in planar p−i−n perovskite solar cells (PeSCs). As a result, the power conversion efficiency (PCE) of the TMA−PTC−based PeSCs is ca. 30% higher than that of the devices without CIL. It was revealed that the enhancement in PCE might be attributed to the improved electron−transporting and hole−blocking properties of the PC61BM/TMA−PTC/Ag interfaces. Moreover, the TMA−PTC devices show remarkably higher stability than those without CIL probably due to the suppressed corrosion of perovskite on Ag cathode. Our findings thus demonstrate a multifunctional and solution−processable CIL which might be a promising block for the fabrication of low−cost, high efficiency and stable planar p−i−n PeSCs.
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ACS Applied Materials & Interfaces
1. Introduction In recent years, there are growing concerns for perovskite solar cells (PeSCs) due to their boosting power conversion efficiency (PCE) from 3.87% to 22.7% in merely eight years.1−6 Mesoporous and planar heterojunctions are typical structures used for PeSCs.7−9 Among them, mesoporous and planar n−i−p PeSCs generally require a high−temperature processing for the deposition of TiO2 layer (~500 °C),10 and suffer from severe current−voltage hysteresis.11 In contrast, planar p−i−n PeSCs with a structure of ITO/HTL/perovskite/ETL/Ag or Al allow for low−temperature processing (
