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An effective approach of vapour assisted morphological tailoring for reducing metal defect sites in lead-free, (CH3NH3)3Bi2I9 bismuth-based perovskite solar cells for improved performance and long-term stability

Sagar Jain, Dibya Phuyal, Matthew Davies Orcid Logo, Meng Li, Bertrand Philippe, Catherine De Castro Orcid Logo, Zhen Qiu, Jinhyun Kim, Trystan Watson Orcid Logo, Wing Chung Tsoi Orcid Logo, Olof Karis, Håkan Rensmo, Gerrit Boschloo, Tomas Edvinsson, James Durrant Orcid Logo

Nano Energy, Volume: 49, Pages: 614 - 624

Swansea University Authors: Sagar Jain, Matthew Davies Orcid Logo, Catherine De Castro Orcid Logo, Trystan Watson Orcid Logo, Wing Chung Tsoi Orcid Logo, James Durrant Orcid Logo

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Abstract

We present a controlled, stepwise formation of methylammonium bismuth iodide (CH3NH3)3Bi2I9 perovskite films prepared via the vapour assisted solution process (VASP) by exposing BiI3 films to CH3NH3I (MAI) vapours for different reaction times, (CH3NH3)3Bi2I9 semiconductor films with tunable optoelec...

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Published in: Nano Energy
ISSN: 2211-2855
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa40033
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Abstract: We present a controlled, stepwise formation of methylammonium bismuth iodide (CH3NH3)3Bi2I9 perovskite films prepared via the vapour assisted solution process (VASP) by exposing BiI3 films to CH3NH3I (MAI) vapours for different reaction times, (CH3NH3)3Bi2I9 semiconductor films with tunable optoelectronic properties are obtained. Solar cells prepared on mesoporous TiO2 substrates yielded hysteresis-free efficiencies upto 3.17% with good reproducibility. The good performance is attributed mainly to the homogeneous surface coverage, improved stoichiometry, reduced metallic content in the bulk, and desired optoelectronic properties of the absorbing material. In addition, solar cells prepared using pure BiI3 films without MAI exposure achieved a power conversion efficiency of 0.34%. The non-encapsulated (CH3NH3)3Bi2I9 devices were found to be stable for as long as 60 days with only 0.1% drop in efficiency. This controlled formation of (CH3NH3)3Bi2I9 perovskite films highlights the benefit of the VASP technique to optimize material stoichiometry, morphology, solar cell performance, and long-term durability.
Keywords: Vapour assisted solution process (VASP); Lead free perovskite; (CH3NH3)3Bi2I9; Morphological tailoring; High resolution X-ray photoelectron (HAXPES) spectroscopy
College: College of Engineering
Start Page: 614
End Page: 624