Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number2000205
Journal / PublicationSolar RRL
Issue number9
Online published27 May 2020
Publication statusPublished - Sep 2020


A highly effective interface engineering approach uses a multifunctional molecule, 5‐amino‐2,4,6‐triiodoisophthalic acid (ATPA), to anchor on TiO2 and CsPbI3 simultaneously by reacting with dangling hydroxyl groups on TiO2 surfaces and passivating the defects of CsPbI3 films. In addition, the introduction of ATPA results in cascade energy‐level alignment between the perovskite and TiO2 electron‐transporting layer (ETL) to improve the electron extraction property. Based on the ATPA‐modified TiO2 substrates, optimized CsPbI3 perovskite solar cells (PVSCs) deliver the highest power conversion efficiency (PCE) of over 18% with suppressed hysteresis. Moreover, the unencapsulated TiO2/ATPA‐based devices exhibit much better long‐term stability and photostability than the only TiO2‐based devices.

Research Area(s)

  • defects passivation, energy-level alignment, inorganic perovskite solar cells, interface engineering, multifunctional molecules