Multi-Functional Regulation on Buried Interface for Achieving Efficient Triple-Cation Perovskite Solar Cells

Yang Ding; Xiangxiang Feng; Erming Feng; Jianhui Chang; Hengyue Li; Caoyu Long; Yuanji Gao; Siyuan Lu; Junliang Yang

doi:10.1002/smll.202308836

Multi-Functional Regulation on Buried Interface for Achieving Efficient Triple-Cation Perovskite Solar Cells

Small. 2024 Jan 22:e2308836. doi: 10.1002/smll.202308836. Online ahead of print.

Authors

Yang Ding^{1

2}, Xiangxiang Feng^{1

2}, Erming Feng^{1

2}, Jianhui Chang^{1

2}, Hengyue Li^{1

2}, Caoyu Long^{1

2}, Yuanji Gao^{1

2}, Siyuan Lu^{1

2}, Junliang Yang^{1

2

3}

Affiliations

¹ Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics, Central South University, Changsha, 410083, China.
² Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, 410083, China.
³ State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan, 410083, China.

PMID: 38258401
DOI: 10.1002/smll.202308836

Abstract

Mixed-cation perovskite solar cells (PSCs) have attracted much attention because of the advantages of suitable bandgap and stability. It is still a challenge to rationally design and modify the perovskite/tin oxide (SnO₂ ) heterogeneous interface for achieving highly efficient and stable PSCs. Herein, a strategy of one-stone-for-three-birds is proposed to achieve multi-functional interface regulation via introducing N-Chlorosuccinimide (NCS) into the solution of SnO₂ : i) C═O functional group in NCS can induces strong binding affinity to uncoordinated defects (oxygen vacancies, free lead ions, etc) at the buried interface and passivate them; ii) incomplete in situ hydrolysis reactions can occur spontaneously and adjust the pH value of the SnO₂ solution to achieve a more matchable energy level; iii) effectively releasing the residual stress of the underlying perovskite. As a result, a champion power conversion efficiency (PCE) of 24.74% is achieved with a device structure of ITO/SnO₂ /Perovskite/Spiro-OMeTAD/Ag, which is one of the highest values for cesium-formamidinium-methylammonium (CsFAMA) triple cation PSCs. Furthermore, the device without encapsulation can sustain 94.6% of its initial PCE after the storage at room temperature and relative humidity (RH) of 20% for 40 days. The research provides a versatile way to manipulate buried interface for achieving efficient and stable PSCs.

Keywords: buried interfaces; defect passivation; mixed-cation perovskite; stress release.

Abstract

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