Citation: Rongjun Zhao, Tai Wu, Yong Hua, Yude Wang. Improving performance of perovskite solar cells enabled by defects passivation and carrier transport dynamics regulation via organic additive[J]. Chinese Chemical Letters, ;2025, 36(2): 109587. doi: 10.1016/j.cclet.2024.109587 shu

Improving performance of perovskite solar cells enabled by defects passivation and carrier transport dynamics regulation via organic additive

Rongjun Zhao ^{a, b} ,
Tai Wu ^b ,
Yong Hua ^{b, *,} ,
Yude Wang ^{c, *,}

a.
Department of Physics, Center for Optoelectronics Engineering Research, Yunnan University, Kunming 650091, China
b.
Yunnan Key Laboratory for Micro/Nano Materials & Technology, International Joint Research Center for Optoelectronic and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China
c.
Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies, Yunnan University, Kunming 6500504, China

huayong@ynu.edu.cn

ydwang@ynu.edu.cn

Received Date: 1 January 2024
Revised Date: 19 January 2024
Accepted Date: 29 January 2024
Available Online: 6 February 2024

Figures(4)

Defects at the grain boundaries (GBs) of perovskite film highly restrict both the efficiency and stability of perovskite solar cells (PSCs). Herein, organic small molecules of butanedioic acid (BA) and acetylenedicarboxylic acid (AA), containing two carbonyl (C=O) groups and different core-units, were incorporated into perovskite as additives for PSCs application. Thanks to the strong coordination interaction between CO group and under-coordinated Pb²⁺, the additives can effectively passivate film defects and regulate the perovskite crystallization, yielding high-quality perovskite films with lower defect densities. More importantly, the additives can efficiently regulate the charge transport behaviors in PSCs. Benefiting from the defects passivation and the regulation of charge carrier dynamics, the BA and AA-treaded PSCs show the power conversion efficiencies of 21.52% and 20.50%, which are higher than that of the control device (19.41%). Besides, the optimal devices exhibit a remarkable enhanced long-term stability and moisture tolerance compared to the pristine devices. Furthermore, the transient absorption spectrum reveals the mechanism of enhanced photovoltaic performances, attributing to the improvement of charge transport capability at the perovskite/Spiro-OMeTAD interfaces. This work affords a promising strategy to improve the efficiency and stability of PSCs through regulating the charge-carrier dynamic process in perovskite film.
- Perovskite solar cells,
- Additives,
- Defects passivation,
- Carrier dynamics,
- Stability
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