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Issue 26, 2018

Carboxylic ester-terminated fulleropyrrolidine as an efficient electron transport material for inverted perovskite solar cells

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Abstract

The interfacial contacts between perovskite crystals and metal electrodes play a significant role in efficient charge transfer in perovskite solar cells (PSCs). In this work, C60 pyrrolidine tris-acid ethyl ester (CPTA-E) has been employed to form a uniform electron transport layer (ETL) covering the perovskite surface in p-i-n-structured PSCs to replace the traditional (6,6)-phenyl-C61-butyric acid methyl ester (PCBM) ETL. X-ray photoelectron spectroscopy analysis of the perovskite/CPTA-E interface reveals that there are strong coordination interactions between the perovskite and CPTA-E, which are beneficial for the adhesion of the CPTA-E ETL on the perovskite surface. On the other hand, steady-state photoluminescence and time-resolved photoluminescence studies of the perovskite films with different quenching layers confirm that CPTA-E ETL has a preferable charge quenching effect compared to the PCBM ETL, which suggests that the CPTA-E ETL has a superior electron extraction and transport ability. The corresponding CPTA-E ETL-based device exhibits a champion power conversion efficiency (PCE) of 17.44% with less hysteresis. Moreover, the steady-state photocurrent output of the CPTA-E-containing PSC is prolonged compared to that of the PCBM-based device. Therefore, this work provides a viable strategy to design suitable electron transport materials for high-performance PSCs.

Graphical abstract: Carboxylic ester-terminated fulleropyrrolidine as an efficient electron transport material for inverted perovskite solar cells

Supplementary files

Article information


Submitted
24 Apr 2018
Accepted
07 Jun 2018
First published
08 Jun 2018

J. Mater. Chem. C, 2018,6, 6982-6987
Article type
Paper

Carboxylic ester-terminated fulleropyrrolidine as an efficient electron transport material for inverted perovskite solar cells

J. Chang, Y. Wang, C. Song, L. Zhu, Q. Guo and J. Fang, J. Mater. Chem. C, 2018, 6, 6982 DOI: 10.1039/C8TC01955J

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