Optoelectronic property refinement of FASnI3 films for photovoltaic application

Publication Type

Journal Article

Publication Date (Issue Year)

2021

Journal Name

Materials Letters

Abstract

Tin (Sn) is a promising substitute for lead (Pb) in organic–inorganic hybrid halide perovskite-photovoltaic devices, but it is prone to delivering low power conversion efficiencies (PCEs) due to the poor quality of Sn-perovskite films. In this work, anilinium hypophosphite (AHP) co-additive is used to fabricate high-quality FASnI3 (FA+: formamidinium) perovskite films with suppressed phase-segregation and prolonged charge carrier lifetime. Perovskite films containing 0.05 M AHP are used to fabricate solar cells and deliver improved power conversion efficiency (PCE) of up to 5.48% (control devices: 4.04%). AHP eliminates the phase separation caused by SnF2 in the absorber, leading to films with enhanced optoelectronic properties, hence the high performance of AHP-based devices.

Keywords

Semiconductors, Solar energy materials, Sn-perovskite, Anilinium hypophosphite

Grantee Name(s)

Jorim Okoth Obila

Project Title

Research and Development of Photovoltaics based on Lead-Free Perovskite Solar Cell Technology

Type of Grant

Research Award

Thematic Area

Energy including Renewables

Funding Statement

We thank the International Science Programme in Physics (Sweden), PASET regional scholarship and innovation fund, National Natural Science Foundation of China (Grant No. 11904115), the Swedish Research Council (VR starting grant: 2018-04809), and the Swedish STINT grant (CH2018-7655) for financial support. We thank Prof. Feng Gao for the laboratory and chemicals.

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