In Situ Formation of Compact PbI2 Shell Boosts the Efficiency and Thermostability of Perovskite Solar Cells

Tianyu Li; Ming Ren; Yuyan Zhang; Lingyi Fang; Jidong Zhang; Yi Yuan; Jing Zhang; Peng Wang

doi:10.1002/smll.202001866

In Situ Formation of Compact PbI₂ Shell Boosts the Efficiency and Thermostability of Perovskite Solar Cells

Small. 2020 Jun;16(25):e2001866. doi: 10.1002/smll.202001866. Epub 2020 May 20.

Authors

Tianyu Li¹, Ming Ren¹, Yuyan Zhang¹, Lingyi Fang¹, Jidong Zhang², Yi Yuan¹, Jing Zhang¹, Peng Wang¹

Affiliations

¹ Department of Chemistry, Zhejiang University, Hangzhou, 310028, China.
² State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Changchun, 130022, China.

PMID: 32432840
DOI: 10.1002/smll.202001866

Abstract

Judicious tailoring of a robust interlayer is central to maintain the durable operation of optoelectronic devices. In this paper, an ultrathin, compact, and uniform PbI₂ shell on the surface of perovskite via the method of ZnI₂ aided in situ transformation is produced. The resultant PbI₂ interlayer can prolong the excited-state lifetime of perovskite and attenuate the recombination kinetics of separated charges, leading to an improvement of power conversion efficiency up to 22.5% for perovskite solar cells (PSCs) at the AM 1.5G conditions. Moreover, the PSC with PbI₂ interlayer exhibits an enhanced thermostability, retaining 87% of initial efficiency after aging at 60 °C for 1000 h.

Keywords: PbI 2; charge recombination; in situ formation; perovskite solar cells; thermostability.

Abstract

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