High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor

Li Chun Chang; The Duong; Viqar Ahmad; Hualin Zhan; Anh Dinh Bui; Jana Isabelle Polzin; Armin Richter; Gabriel Bartholazzi; Keqing Huang; Zhongshu Yang; Wei Wang; Yihui Hou; Li Li; Qian Cui; Rabin Basnet; Jianfei Yang; Hong Lin; Guozheng Du; Khoa Nguyen; Dang Thuan Nguyen; Lachlan E. Black; Daniel MacDonald; Daniel Walter; Klaus J. Weber; Kylie R. Catchpole; Heping Shen

doi:10.1007/s40820-025-01959-y

High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor

Li Chun Chang
, The Duong
, Viqar Ahmad
, Hualin Zhan
, Anh Dinh Bui
, Jana Isabelle Polzin
, Armin Richter
, Gabriel Bartholazzi
, Keqing Huang
, Zhongshu Yang
, Wei Wang
, Yihui Hou
, Li Li
, Qian Cui
, Rabin Basnet
, Jianfei Yang
, Hong Lin
, Guozheng Du
, Khoa Nguyen
, Dang Thuan Nguyen

Lachlan E. Black, Daniel MacDonald, Daniel Walter, Klaus J. Weber, Kylie R. Catchpole, Heping Shen^*

^*Corresponding author for this work

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

8 Citations (SciVal)

Abstract

By mixing 2PACz and Me-4PACz, an energetically homogeneous buried interface is formed, enabling preferential energy alignment at the hole transport layer/perovskite (1.67 eV) interface, which delivers a certified fill factor of 86.8% and a power conversion efficiency of 23.42%. Simulations indicate that at lower interface defect densities (1 × 10⁸–1 × 10¹¹ cm⁻²), improvements in FF dominate the device performance, whereas at higher defect densities (1 × 10¹²–1 × 10¹³ cm⁻²), V_oc is the key factor.

Original language	English
Article number	122
Number of pages	19
Journal	Nano-Micro Letters
Volume	18
Issue number	1
Early online date	14 Jan 2026
DOIs	https://doi.org/10.1007/s40820-025-01959-y
Publication status	E-pub ahead of print - 14 Jan 2026

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Chang, L. C., Duong, T., Ahmad, V., Zhan, H., Bui, A. D., Polzin, J. I., Richter, A., Bartholazzi, G., Huang, K., Yang, Z., Wang, W., Hou, Y., Li, L., Cui, Q., Basnet, R., Yang, J., Lin, H., Du, G., Nguyen, K., ... Shen, H. (2026). High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor. Nano-Micro Letters, 18(1), Article 122. Advance online publication. https://doi.org/10.1007/s40820-025-01959-y

@article{f44071daf4624ee390a93a35332dc118,

title = "High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor",

abstract = "By mixing 2PACz and Me-4PACz, an energetically homogeneous buried interface is formed, enabling preferential energy alignment at the hole transport layer/perovskite (1.67 eV) interface, which delivers a certified fill factor of 86.8\% and a power conversion efficiency of 23.42\%. Simulations indicate that at lower interface defect densities (1 × 108–1 × 1011 cm−2), improvements in FF dominate the device performance, whereas at higher defect densities (1 × 1012–1 × 1013 cm−2), Voc is the key factor.",

keywords = "Interface energy-level alignment, Inverted perovskite solar cells, Self-assembled monolayers, Tandem solar cells, Wide-bandgap perovskite",

author = "Chang, \{Li Chun\} and The Duong and Viqar Ahmad and Hualin Zhan and Bui, \{Anh Dinh\} and Polzin, \{Jana Isabelle\} and Armin Richter and Gabriel Bartholazzi and Keqing Huang and Zhongshu Yang and Wei Wang and Yihui Hou and Li Li and Qian Cui and Rabin Basnet and Jianfei Yang and Hong Lin and Guozheng Du and Khoa Nguyen and Nguyen, \{Dang Thuan\} and Black, \{Lachlan E.\} and Daniel MacDonald and Daniel Walter and Weber, \{Klaus J.\} and Catchpole, \{Kylie R.\} and Heping Shen",

note = "{\textcopyright} 2026 The Authors",

year = "2026",

month = jan,

day = "14",

doi = "10.1007/s40820-025-01959-y",

language = "English",

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journal = "Nano-Micro Letters",

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Chang, LC, Duong, T , Ahmad, V , Zhan, H , Bui, AD, Polzin, JI, Richter, A, Bartholazzi, G, Huang, K, Yang, Z, Wang, W, Hou, Y, Li, L, Cui, Q, Basnet, R, Yang, J, Lin, H, Du, G, Nguyen, K, Nguyen, DT, Black, LE , MacDonald, D , Walter, D , Weber, KJ , Catchpole, KR & Shen, H 2026, 'High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor', Nano-Micro Letters, vol. 18, no. 1, 122. https://doi.org/10.1007/s40820-025-01959-y

TY - JOUR

T1 - High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor

AU - Chang, Li Chun

AU - Duong, The

AU - Ahmad, Viqar

AU - Zhan, Hualin

AU - Bui, Anh Dinh

AU - Polzin, Jana Isabelle

AU - Richter, Armin

AU - Bartholazzi, Gabriel

AU - Huang, Keqing

AU - Yang, Zhongshu

AU - Wang, Wei

AU - Hou, Yihui

AU - Li, Li

AU - Cui, Qian

AU - Basnet, Rabin

AU - Yang, Jianfei

AU - Lin, Hong

AU - Du, Guozheng

AU - Nguyen, Khoa

AU - Nguyen, Dang Thuan

AU - Black, Lachlan E.

AU - MacDonald, Daniel

AU - Walter, Daniel

AU - Weber, Klaus J.

AU - Catchpole, Kylie R.

AU - Shen, Heping

PY - 2026/1/14

Y1 - 2026/1/14

N2 - By mixing 2PACz and Me-4PACz, an energetically homogeneous buried interface is formed, enabling preferential energy alignment at the hole transport layer/perovskite (1.67 eV) interface, which delivers a certified fill factor of 86.8% and a power conversion efficiency of 23.42%. Simulations indicate that at lower interface defect densities (1 × 108–1 × 1011 cm−2), improvements in FF dominate the device performance, whereas at higher defect densities (1 × 1012–1 × 1013 cm−2), Voc is the key factor.

AB - By mixing 2PACz and Me-4PACz, an energetically homogeneous buried interface is formed, enabling preferential energy alignment at the hole transport layer/perovskite (1.67 eV) interface, which delivers a certified fill factor of 86.8% and a power conversion efficiency of 23.42%. Simulations indicate that at lower interface defect densities (1 × 108–1 × 1011 cm−2), improvements in FF dominate the device performance, whereas at higher defect densities (1 × 1012–1 × 1013 cm−2), Voc is the key factor.

KW - Interface energy-level alignment

KW - Inverted perovskite solar cells

KW - Self-assembled monolayers

KW - Tandem solar cells

KW - Wide-bandgap perovskite

UR - https://www.scopus.com/pages/publications/105027366218

U2 - 10.1007/s40820-025-01959-y

DO - 10.1007/s40820-025-01959-y

M3 - Article

AN - SCOPUS:105027366218

SN - 2311-6706

VL - 18

JO - Nano-Micro Letters

JF - Nano-Micro Letters

IS - 1

M1 - 122

ER -

High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor

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