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Extending Photoresponse to the Near‐Infrared Region for Inverted Perovskite Solar Cells by Using a Low‐Bandgap Electron Transporting Material
Author(s) -
Wu Fei,
Gao Wei,
Zhu Linna,
Lu Huiqiang,
Yang Chuluo
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900565
Subject(s) - materials science , perovskite (structure) , optoelectronics , short circuit , band gap , absorption (acoustics) , electron , wavelength , quantum efficiency , infrared , near infrared spectroscopy , current density , voltage , optics , chemistry , physics , quantum mechanics , composite material , crystallography
Lead‐based organic–inorganic hybrid perovskite solar cells (PSCs) usually show an absorption edge around 800 nm, while the near‐infrared (NIR) wavelength beyond 800 nm cannot be utilized. Herein, a new indacenothiophene‐based electron transporting material (ETM), namely, ITCP‐M, is developed, which works to enhance electron extraction and electron transporting, and simultaneously extends photoresponses to the NIR region in MAPbI 3 ‐based inverted PSCs. Notably, the ITCP‐M‐based device exhibits a prominent photoresponse beyond 800 nm as observed from the external quantum efficiency (EQE) spectra, contributing to enhanced short‐circuit current density ( J sc ) without sacrificing the open‐circuit voltage and fill factor. As a result, inverted PSCs using ITCP‐M ETM delivers a high efficiency of 19.15%, representing one of the highest efficiencies in inverted PSCs using nonfullerene ETMs. This work provides a new and simple strategy to extend photoresponses to the NIR absorption region for MAPbI 3 ‐based inverted PSCs that can significantly improve device performance.