Enhanced Carrier Diffusion Enables Efficient Back-Contact Perovskite Photovoltaics

Boya Zhao; Lara V. Gillan; Andrew D. Scully; Anthony S.R. Chesman; Boer Tan; Xiongfeng Lin; Jingying Liu; Kevin J. Rietwyk; Siqi Deng; Christopher Bailey; Yi Bing Cheng; Dane R. McCamey; Udo Bach

doi:10.1002/anie.202218174

Enhanced Carrier Diffusion Enables Efficient Back-Contact Perovskite Photovoltaics

Boya Zhao
, Lara V. Gillan
, Andrew D. Scully
, Anthony S.R. Chesman
, Boer Tan
, Xiongfeng Lin
, Jingying Liu
, Kevin J. Rietwyk
, Siqi Deng
, Christopher Bailey
, Yi Bing Cheng
, Dane R. McCamey
, Udo Bach

Monash University
ARC Centre of Excellence in Exciton Science
University of New South Wales
CSIRO
Wuhan University of Technology
Foshan Xianhu Laboratory

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

Back-contact architectures offer a promising route to improve the record efficiencies of perovskite solar cells (PSCs) by eliminating parasitic light absorption. However, the performance of back-contact PSCs is limited by inadequate carrier diffusion in perovskite. Here, we report that perovskite films with a preferred out-of-plane orientation show improved carrier dynamic properties. With the addition of guanidine thiocyanate, the films exhibit carrier lifetimes and mobilities increased by 3–5 times, leading to diffusion lengths exceeding 7 μm. The enhanced carrier diffusion results from substantial suppression of nonradiative recombination and improves charge collection. Devices using such films achieve reproducible efficiencies reaching 11.2 %, among the best performances for back-contact PSCs. Our findings demonstrate the impact of carrier dynamics on back-contact PSCs and provide the basis for a new route to high-performance back-contact perovskite optoelectronic devices at low cost.

Original language	English
Article number	e202218174
Journal	Angewandte Chemie - International Edition
Volume	62
Issue number	27
Early online date	23 Mar 2023
DOIs	https://doi.org/10.1002/anie.202218174
State	Published - 3 Jul 2023
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2023 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.

Funding

This work was financially supported by the Australian Centre for Advanced Photovoltaics (ACAP), the Australian Renewable Energy Agency (ARENA), and the Australian Research Council (ARC) Centre of Excellence in Exciton Science (ACEx: CE170100026). This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). The authors acknowledge the use of the facilities and the assistance of Dr. Jisheng Ma at the Monash X‐ray Platform. The authors acknowledge the assistance of Dr. Mark Styles at the Commonwealth Scientific and Industrial Research Organization (CSIRO). Open Access publishing facilitated by Monash University, as part of the Wiley ‐ Monash University agreement via the Council of Australian University Librarians. This work was financially supported by the Australian Centre for Advanced Photovoltaics (ACAP), the Australian Renewable Energy Agency (ARENA), and the Australian Research Council (ARC) Centre of Excellence in Exciton Science (ACEx: CE170100026). This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). The authors acknowledge the use of the facilities and the assistance of Dr. Jisheng Ma at the Monash X-ray Platform. The authors acknowledge the assistance of Dr. Mark Styles at the Commonwealth Scientific and Industrial Research Organization (CSIRO). Open Access publishing facilitated by Monash University, as part of the Wiley - Monash University agreement via the Council of Australian University Librarians.

Funders	Funder number
ACEx	CE170100026
Australian University Librarians
Wiley – Monash University
Australian Centre for Advanced Photovoltaics
Australian Research Council
Commonwealth Scientific and Industrial Research Organisation
Monash University
Australian Renewable Energy Agency
Centre of Excellence in Exciton Science

Keywords

Back-Contact Architecture
Carrier Dynamics
Crystallographic Orientation
Guanidine Thiocyanate
Perovskite Solar Cells

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10.1002/anie.202218174

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abstract = "Back-contact architectures offer a promising route to improve the record efficiencies of perovskite solar cells (PSCs) by eliminating parasitic light absorption. However, the performance of back-contact PSCs is limited by inadequate carrier diffusion in perovskite. Here, we report that perovskite films with a preferred out-of-plane orientation show improved carrier dynamic properties. With the addition of guanidine thiocyanate, the films exhibit carrier lifetimes and mobilities increased by 3{\textendash}5 times, leading to diffusion lengths exceeding 7 μm. The enhanced carrier diffusion results from substantial suppression of nonradiative recombination and improves charge collection. Devices using such films achieve reproducible efficiencies reaching 11.2 \%, among the best performances for back-contact PSCs. Our findings demonstrate the impact of carrier dynamics on back-contact PSCs and provide the basis for a new route to high-performance back-contact perovskite optoelectronic devices at low cost.",

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AU - Liu, Jingying

AU - Rietwyk, Kevin J.

AU - Deng, Siqi

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AU - Bach, Udo

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AB - Back-contact architectures offer a promising route to improve the record efficiencies of perovskite solar cells (PSCs) by eliminating parasitic light absorption. However, the performance of back-contact PSCs is limited by inadequate carrier diffusion in perovskite. Here, we report that perovskite films with a preferred out-of-plane orientation show improved carrier dynamic properties. With the addition of guanidine thiocyanate, the films exhibit carrier lifetimes and mobilities increased by 3–5 times, leading to diffusion lengths exceeding 7 μm. The enhanced carrier diffusion results from substantial suppression of nonradiative recombination and improves charge collection. Devices using such films achieve reproducible efficiencies reaching 11.2 %, among the best performances for back-contact PSCs. Our findings demonstrate the impact of carrier dynamics on back-contact PSCs and provide the basis for a new route to high-performance back-contact perovskite optoelectronic devices at low cost.

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Enhanced Carrier Diffusion Enables Efficient Back-Contact Perovskite Photovoltaics

Abstract

Bibliographical note

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Keywords

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