Impermeable inorganic “walls” sandwiching perovskite layer toward inverted and indoor photovoltaic devices

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

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Author(s)

  • Jie Xu
  • Jun Xi
  • Hua Dong
  • Namyoung Ahn
  • Jinbo Chen
  • Peizhou Li
  • Xinyi Zhu
  • Jinfei Dai
  • Ziyang Hu
  • Bo Jiao
  • Xun Hou
  • Jingrui Li
  • Zhaoxin Wu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number106286
Journal / PublicationNano Energy
Volume88
Online published24 Jun 2021
Publication statusPublished - Oct 2021

Abstract

Interfaces between the perovskite active layer and the charge-transport layers (CTLs) play a critical role in both efficiency and stability of halide-perovskite photovoltaics. One of the major concerns is that surface defects of perovskite could cause detrimental nonradiative recombination and material degradation. In this work, we addressed this challenging problem by inserting ultrathin alkali-fluoride (AF) films between the tri-cation lead-iodide perovskite layer and both CTLs. This bilateral inorganic “walls” strategy makes use of both physical-blocking and chemical-anchoring functionalities of the continuous, uniform and compact AF framework: on the one hand, the uniformly distributed alkali-iodine coordination at the perovskite-AF interfaces effectively suppresses the formation of iodine-vacancy defects at the surfaces, thus reducing the trap-assisted recombination at the perovskite-CTL interfaces and therewith the open-voltage loss; on the other hand, the impermeable AF buffer layers effectively prevent the bidirectional ion migration at the perovskite-CTLs interfaces even under harsh working conditions. As a result, a power-conversion efficiency (PCE) of 22.02% (certified efficiency 20.4%) with low open-voltage deficit (<0.4 V) was achieved for the low-temperature processed inverted planar perovskite solar cells. Exceptional operational stability (500 h, ISOS-L-2) and thermal stability (1000 h, ISOS-D-2) were obtained. Meanwhile, a 35.7% PCE was obtained under dim-light source (1000 lux white LED light) with the optimized device, which is among the best records in perovskite indoor photovoltaics.

Research Area(s)

  • Alkali fluorides, Indoor photovoltaics, Interface recombination, Perovskite solar cells, Stability

Citation Format(s)

Impermeable inorganic “walls” sandwiching perovskite layer toward inverted and indoor photovoltaic devices. / Xu, Jie; Xi, Jun; Dong, Hua; Ahn, Namyoung; Zhu, Zonglong; Chen, Jinbo; Li, Peizhou; Zhu, Xinyi; Dai, Jinfei; Hu, Ziyang; Jiao, Bo; Hou, Xun; Li, Jingrui; Wu, Zhaoxin.

In: Nano Energy, Vol. 88, 106286, 10.2021.

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