Composition Engineering of All‐Inorganic Perovskite Film for Efficient and Operationally Stable Solar Cells

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

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Author(s)

  • Jingjing Tian
  • Qifan Xue
  • Tianqi Niu
  • Lei Yan
  • Ning Li
  • Christoph J. Brabec
  • Yong Cao

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2001764
Journal / PublicationAdvanced Functional Materials
Volume30
Issue number28
Online published2 Jun 2020
Publication statusPublished - 9 Jul 2020

Link(s)

Abstract

Cesium-based inorganic perovskites have recently attracted great research focus due to their excellent optoelectronic properties and thermal stability. However, the operational instability of all-inorganic perovskites is still a main hindrance for the commercialization. Herein, a facile approach is reported to simultaneously enhance both the efficiency and long-term stability for all-inorganic CsPbI2.5Br0.5 perovskite solar cells via inducing excess lead iodide (PbI2) into the precursors. Comprehensive film and device characterizations are conducted to study the influences of excess PbI2 on the crystal quality, passivation effect, charge dynamics, and photovoltaic performance. It is found that excess PbI2 improves the crystallization process, producing high-quality CsPbI2.5Br0.5 films with enlarged grain sizes, enhanced crystal orientation, and unchanged phase composition. The residual PbI2 at the grain boundaries also provides a passivation effect, which improves the optoelectronic properties and charge collection property in optimized devices, leading to a power conversion efficiency up to 17.1% with a high open-circuit voltage of 1.25 V. More importantly, a remarkable long-term operational stability is also achieved for the optimized CsPbI2.5Br0.5 solar cells, with less than 24% degradation drop at the maximum power point under continuous illumination for 420 h.

Research Area(s)

  • composition engineering, CsPbI 2.5Br 0.5, defect passivation, operationally stable, PbI 2

Citation Format(s)

Composition Engineering of All‐Inorganic Perovskite Film for Efficient and Operationally Stable Solar Cells. / Tian, Jingjing; Wang, Jing; Xue, Qifan; Niu, Tianqi; Yan, Lei; Zhu, Zonglong; Li, Ning; Brabec, Christoph J.; Yip, Hin-Lap; Cao, Yong.

In: Advanced Functional Materials, Vol. 30, No. 28, 2001764, 09.07.2020.

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

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