Efficient Inverted Perovskite Solar Cells with Low Voltage Loss Achieved by a Pyridine-Based Dopant-Free Polymer Semiconductor

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

9 Scopus Citations
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Author(s)

  • Xianglang Sun
  • Xinyu Yu
  • Cheng Zhong
  • Danjun Liu
  • Zhong'an Li

Detail(s)

Original languageEnglish
Pages (from-to)7227-7233
Journal / PublicationAngewandte Chemie - International Edition
Volume60
Issue number13
Online published28 Dec 2020
Publication statusPublished - 22 Mar 2021

Abstract

Currently, the performance improvement for inverted perovskite solar cells (PVSCs) is mainly limited by the high open circuit voltage (VOC) loss caused by detrimental non-radiative recombination (NRR) processes. Herein, we report a simple and efficient way to simultaneously reduce the NRR processes inside perovskites and at the interface by rationally designing a new pyridine-based polymer hole-transporting material (HTM), PPY2, which exhibits suitable energy levels with perovskites, high hole mobility, effective passivation of the uncoordinated Pb2+ and iodide defects, as well as the capability of promoting the formation of high-quality polycrystalline perovskite films. In absence of any dopants, the inverted PVSCs using PPY2 as the HTM deliver an encouraging PCE up to 22.41 % with a small VOC loss (0.40 V), among the best device performances for inverted PVSCs reported so far. Furthermore, PPY2-based unencapsulated devices show an excellent long-term photostability, and over 97 % of its initial PCE can be maintained after one sun constant illumination for 500 h.

Research Area(s)

  • defect passivation, dopant-free hole-transporting materials, inverted perovskite solar cells, non-radiative recombination

Citation Format(s)

Efficient Inverted Perovskite Solar Cells with Low Voltage Loss Achieved by a Pyridine-Based Dopant-Free Polymer Semiconductor. / Sun, Xianglang; Li, Zhen; Yu, Xinyu; Wu, Xin; Zhong, Cheng; Liu, Danjun; Lei, Dangyuan; Jen, Alex K.-Y.; Li, Zhong'an; Zhu, Zonglong.

In: Angewandte Chemie - International Edition, Vol. 60, No. 13, 22.03.2021, p. 7227-7233.

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