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High Efficiency Perovskite‐Silicon Tandem Solar Cells: Effect of Surface Coating versus Bulk Incorporation of 2D Perovskite
Author(s) -
Duong The,
Pham Huyen,
Kho Teng Choon,
Phang Pheng,
Fong Kean Chern,
Yan Di,
Yin Yanting,
Peng Jun,
Mahmud Md Arafat,
Gharibzadeh Saba,
Nejand Bahram Abdollahi,
Hossain Ihteaz M.,
Khan Motiur Rahman,
Mozaffari Naeimeh,
Wu YiLiang,
Shen Heping,
Zheng Jianghui,
Mai Haoxin,
Liang Wensheng,
Samundsett Chris,
Stocks Matthew,
McIntosh Keith,
Andersson Gunther G.,
Lemmer Uli,
Richards Bryce S.,
Paetzold Ulrich W.,
HoBallie Anita,
Liu Yun,
Macdonald Daniel,
Blakers Andrew,
WongLeung Jennifer,
White Thomas,
Weber Klaus,
Catchpole Kylie
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201903553
Subject(s) - perovskite (structure) , materials science , tandem , crystallinity , silicon , chemical engineering , coating , phase (matter) , crystalline silicon , nanotechnology , optoelectronics , composite material , chemistry , organic chemistry , engineering
Mixed‐dimensional perovskite solar cells combining 3D and 2D perovskites have recently attracted wide interest owing to improved device efficiency and stability. Yet, it remains unclear which method of combining 3D and 2D perovskites works best to obtain a mixed‐dimensional system with the advantages of both types. To address this, different strategies of combining 2D perovskites with a 3D perovskite are investigated, namely surface coating and bulk incorporation. It is found that through surface coating with different aliphatic alkylammonium bulky cations, a Ruddlesden–Popper “quasi‐2D” perovskite phase is formed on the surface of the 3D perovskite that passivates the surface defects and significantly improves the device performance. In contrast, incorporating those bulky cations into the bulk induces the formation of the pure 2D perovskite phase throughout the bulk of the 3D perovskite, which negatively affects the crystallinity and electronic structure of the 3D perovskite framework and reduces the device performance. Using the surface‐coating strategy with n ‐butylammonium bromide to fabricate semitransparent perovskite cells and combining with silicon cells in four‐terminal tandem configuration, 27.7% tandem efficiency with interdigitated back contact silicon bottom cells (size‐unmatched) and 26.2% with passivated emitter with rear locally diffused silicon bottom cells is achieved in a 1 cm 2 size‐matched tandem.