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Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency
Author(s) -
Liu Tiantian,
Zhang Jie,
Wu Xin,
Liu Hongbin,
Li Fengzhu,
Deng Xiang,
Lin Francis,
Li Xiaosong,
Zhu Zonglong,
Jen Alex K.-Y.
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.202000205
Subject(s) - perovskite (structure) , energy conversion efficiency , materials science , hysteresis , molecule , chemical engineering , perovskite solar cell , cascade , nanotechnology , optoelectronics , chemistry , organic chemistry , physics , quantum mechanics , engineering
A highly effective interface engineering approach uses a multifunctional molecule, 5‐amino‐2,4,6‐triiodoisophthalic acid (ATPA), to anchor on TiO 2 and CsPbI 3 simultaneously by reacting with dangling hydroxyl groups on TiO 2 surfaces and passivating the defects of CsPbI 3 films. In addition, the introduction of ATPA results in cascade energy‐level alignment between the perovskite and TiO 2 electron‐transporting layer (ETL) to improve the electron extraction property. Based on the ATPA‐modified TiO 2 substrates, optimized CsPbI 3 perovskite solar cells (PVSCs) deliver the highest power conversion efficiency (PCE) of over 18% with suppressed hysteresis. Moreover, the unencapsulated TiO 2 /ATPA‐based devices exhibit much better long‐term stability and photostability than the only TiO 2 ‐based devices.