Crystallization Modulation for Stable Wide-Bandgap Perovskite Solar Cells and Modules

Leyu Bi; Jiarong Wang; Qiang Fu; Alex K.-Y. Jen

doi:10.1002/adma.74388

Crystallization Modulation for Stable Wide-Bandgap Perovskite Solar Cells and Modules

Leyu Bi
, Jiarong Wang
, Qiang Fu^*
, Alex K.-Y. Jen^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Abstract

As the power conversion efficiency (PCE) of single-junction perovskite solar cells (PSCs) approaches the Shockley–Queisser theoretical limit, perovskite-based tandem solar cells (TSCs) have been widely recognized as a key pathway to surpass single-junction PSCs and enable next-generation high-performance photovoltaics. However, wide-bandgap (WBG) perovskites, particularly mixed-halide systems, still face significant challenges, including photoinduced phase segregation, high defect densities, and interfacial mismatches. These issues largely stem from their complex crystallization processes. This review describes how inhomogeneous crystallization of WBG perovskites underlies the following challenges: initial phase segregation, defect formation, and stability issues. Following this, a comprehensive review of recent advances in crystallization modulation was carried out. Strategies such as interface engineering, composition engineering, solvent engineering, process optimization, and additive engineering are discussed, with a focus on precisely modulating nucleation and growth to achieve high-quality WBG perovskites. Finally, the development of large-area fabrication of WBG perovskites and stability issues are summarized, and future research directions are outlined. © 2026 Wiley-VCH GmbH.

Original language	English
Article number	e74388
Number of pages	24
Journal	Advanced Materials
Online published	1 Aug 2026
DOIs	https://doi.org/10.1002/adma.74388
Publication status	Online published - 1 Aug 2026

Funding

A.K.Y.J. thanks the sponsorship of the Lee Shau\u2010Kee Chair Professor (Materials Science) and the support from the APRC Grants (9380086, 9610419, 9610440, 9610492, 9610508) of the City University of Hong Kong, the TCFS grant (GHP/121/22SZ) from the Innovation and Technology Commission of Hong Kong, the GRF grants (11304424, 11308625, 11316422) and CRS grants (CRS_CityU104/23, CRS_HKUST203/23) from the Research Grants Council of Hong Kong, and Grant No. T2541160284 from the National Natural Science Foundation of China. This work was partially financially supported by City University of Hong Kong (9610739) for the project \u201CFostering Innovation for Resilience and Sustainable Transformation,\u201D officially endorsed by the United Nations Educational, Scientific and Cultural Organization under the International Decade of Sciences for Sustainable Development (2024\u20132033). Q. F. gratefully acknowledges the financial support from the Fundamental Research Funds for the Central Universities of Nankai University (020\u201092612054). L. B. thanks the financial support through the RGC Junior Research Fellow Scheme (CityU JRFS2627\u20101S01) from the RGC of the Hong Kong Special Administrative Region, China.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Research Keywords

crystallization
perovskite solar cells
phase segregation
stability
wide-bandgap perovskite

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title = "Crystallization Modulation for Stable Wide-Bandgap Perovskite Solar Cells and Modules",

abstract = "As the power conversion efficiency (PCE) of single-junction perovskite solar cells (PSCs) approaches the Shockley–Queisser theoretical limit, perovskite-based tandem solar cells (TSCs) have been widely recognized as a key pathway to surpass single-junction PSCs and enable next-generation high-performance photovoltaics. However, wide-bandgap (WBG) perovskites, particularly mixed-halide systems, still face significant challenges, including photoinduced phase segregation, high defect densities, and interfacial mismatches. These issues largely stem from their complex crystallization processes. This review describes how inhomogeneous crystallization of WBG perovskites underlies the following challenges: initial phase segregation, defect formation, and stability issues. Following this, a comprehensive review of recent advances in crystallization modulation was carried out. Strategies such as interface engineering, composition engineering, solvent engineering, process optimization, and additive engineering are discussed, with a focus on precisely modulating nucleation and growth to achieve high-quality WBG perovskites. Finally, the development of large-area fabrication of WBG perovskites and stability issues are summarized, and future research directions are outlined. {\textcopyright} 2026 Wiley-VCH GmbH.",

keywords = "crystallization, perovskite solar cells, phase segregation, stability, wide-bandgap perovskite",

author = "Leyu Bi and Jiarong Wang and Qiang Fu and Jen, \{Alex K.-Y.\}",

year = "2026",

month = aug,

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doi = "10.1002/adma.74388",

language = "English",

journal = "Advanced Materials",

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T1 - Crystallization Modulation for Stable Wide-Bandgap Perovskite Solar Cells and Modules

AU - Bi, Leyu

AU - Wang, Jiarong

AU - Fu, Qiang

AU - Jen, Alex K.-Y.

PY - 2026/8/1

Y1 - 2026/8/1

N2 - As the power conversion efficiency (PCE) of single-junction perovskite solar cells (PSCs) approaches the Shockley–Queisser theoretical limit, perovskite-based tandem solar cells (TSCs) have been widely recognized as a key pathway to surpass single-junction PSCs and enable next-generation high-performance photovoltaics. However, wide-bandgap (WBG) perovskites, particularly mixed-halide systems, still face significant challenges, including photoinduced phase segregation, high defect densities, and interfacial mismatches. These issues largely stem from their complex crystallization processes. This review describes how inhomogeneous crystallization of WBG perovskites underlies the following challenges: initial phase segregation, defect formation, and stability issues. Following this, a comprehensive review of recent advances in crystallization modulation was carried out. Strategies such as interface engineering, composition engineering, solvent engineering, process optimization, and additive engineering are discussed, with a focus on precisely modulating nucleation and growth to achieve high-quality WBG perovskites. Finally, the development of large-area fabrication of WBG perovskites and stability issues are summarized, and future research directions are outlined. © 2026 Wiley-VCH GmbH.

AB - As the power conversion efficiency (PCE) of single-junction perovskite solar cells (PSCs) approaches the Shockley–Queisser theoretical limit, perovskite-based tandem solar cells (TSCs) have been widely recognized as a key pathway to surpass single-junction PSCs and enable next-generation high-performance photovoltaics. However, wide-bandgap (WBG) perovskites, particularly mixed-halide systems, still face significant challenges, including photoinduced phase segregation, high defect densities, and interfacial mismatches. These issues largely stem from their complex crystallization processes. This review describes how inhomogeneous crystallization of WBG perovskites underlies the following challenges: initial phase segregation, defect formation, and stability issues. Following this, a comprehensive review of recent advances in crystallization modulation was carried out. Strategies such as interface engineering, composition engineering, solvent engineering, process optimization, and additive engineering are discussed, with a focus on precisely modulating nucleation and growth to achieve high-quality WBG perovskites. Finally, the development of large-area fabrication of WBG perovskites and stability issues are summarized, and future research directions are outlined. © 2026 Wiley-VCH GmbH.

KW - crystallization

KW - perovskite solar cells

KW - phase segregation

KW - stability

KW - wide-bandgap perovskite

UR - https://www.scopus.com/pages/publications/105046057609

UR - https://www.scopus.com/pages/publications/105046057609#tab=impact

U2 - 10.1002/adma.74388

DO - 10.1002/adma.74388

M3 - RGC 21 - Publication in refereed journal

SN - 0935-9648

JO - Advanced Materials

JF - Advanced Materials

M1 - e74388

ER -

Crystallization Modulation for Stable Wide-Bandgap Perovskite Solar Cells and Modules

Abstract

Funding

UN SDGs

Research Keywords

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