Universal buried interface modification with lead iodide for efficient and stable perovskite solar cells

Dang-Thuan Nguyen; Anh Dinh Bui; Daniel Walter; Khoa Nguyen; Hualin Zhan; Xuan Minh Chau Ta; Grace Dansoa Tabi; Thành Trần-Phú; Li-Chun Chang; Keqing Huang; Minh Anh Truong; Atsushi Wakamiya; Sunita Gautam Adhikari; Hieu Nguyen; Anne Haggren; Viqar Ahmad; Thanh-Tung Duong; Nguyen Duy Cuong; Heping Shen; Kylie Catchpole; Klaus Weber; Thomas White; The Duong

doi:10.1039/D5TA01282A

Universal buried interface modification with lead iodide for efficient and stable perovskite solar cells†

Dang-Thuan Nguyen,

*^a Anh Dinh Bui,^a Daniel Walter,

^a Khoa Nguyen,

^a Hualin Zhan,

^a Xuan Minh Chau Ta,^bc Grace Dansoa Tabi,

^a Thành Trần-Phú,‡^b Li-Chun Chang,

^a Keqing Huang,^a Minh Anh Truong,

^d Atsushi Wakamiya,

^d Sunita Gautam Adhikari,^e Hieu Nguyen,

^a Anne Haggren,^a Viqar Ahmad,

^a Thanh-Tung Duong,^f Nguyen Duy Cuong,^f Heping Shen,

^a Kylie Catchpole,^a Klaus Weber,

^a Thomas White

^a and The Duong

*^a

Author affiliations

* Corresponding authors

^a School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
E-mail: dangthuan.nguyen@anu.edu.au, the.duong@anu.edu.au

^b Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia

^c Faculty of Engineering, University of Sydney, NSW 2006, Australia

^d Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, Japan

^e Institute of Nanoscale Science and Technology, Flinders University, South Australia, Australia

^f School of Materials Science and Engineering, Hanoi University of Science and Technology, No. 1, Dai Co Viet Street, Hai Ba Trung District, Hanoi, Vietnam

Abstract

A controlled amount of excess lead iodide (PbI₂) in the perovskite precursor has been widely used in perovskite solar cells (PSCs) to enhance the device's performance by passivating defects. However, an excessive amount of PbI₂ can lead to significant hysteresis and reduced stability. Managing the excess PbI₂ in the perovskite bulk and on the top (exposed) surface is achievable, but the bottom surface presents a challenge. This study offers a method for adjusting the amount of excess PbI₂ in perovskite solar cells at both the bottom surface and the bulk of the perovskite layer. This treatment, known as buried interface modification, is effective for both negative-intrinsic-positive (n-i-p) and positive-intrinsic-negative (p-i-n) structures, achieving efficiencies of 25.9% and 24.6%, respectively, with negligible hysteresis and excellent stability of over 1000 hours under light at the maximum power point.

Journal of Materials Chemistry A

Universal buried interface modification with lead iodide for efficient and stable perovskite solar cells†

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Universal buried interface modification with lead iodide for efficient and stable perovskite solar cells

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