The Effect of the Alkyl Chains of the Alkylammonium Pesudohalide Additives on the Performance of Dion Jacobson Perovskite Solar Cells

Xiaodan Cui; Hui Zhang; Jianing Duan; Jingjin Dong; Jun Xi; Shuyan Shao; Zhuping Fei; Zhen Li

doi:10.1002/smll.202302450

The Effect of the Alkyl Chains of the Alkylammonium Pesudohalide Additives on the Performance of Dion Jacobson Perovskite Solar Cells

Small. 2023 Oct;19(41):e2302450. doi: 10.1002/smll.202302450. Epub 2023 Jun 13.

Authors

Xiaodan Cui¹, Hui Zhang¹, Jianing Duan², Jingjin Dong³, Jun Xi², Shuyan Shao¹, Zhuping Fei⁴, Zhen Li^{1

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Affiliations

¹ Institute of Molecular Aggregation Science, Tianjin University, Tianjin, 300072, China.
² Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
³ Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing, Jiangsu, 211816, China.
⁴ Department of Chemistry, Institute of Molecular Plus, Tianjin University, Tianjin, 300072, China.
⁵ Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin, 300072, China.
⁶ Department of Chemistry, Wuhan University, Wuhan, 430072, China.
⁷ Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou, 350207, China.

PMID: 37312671
DOI: 10.1002/smll.202302450

Abstract

Dion-Jacobson perovskite (DJP) films suffer from the high structural disorder and non-compact morphology, leading to inefficient and unstable solar cells (SCs). Here, how the alkyl chains of alkylammonium pseudohalide additives including methylammonium thiocyanate (MASCN) and ethylammonium thiocyanate (EASCN), and propylammonium thiocyanate (PASCN), impact the microstructures, optoelectronic properties and the performance of the solar cells is investigated. These additives substantially improve the structural order and the morphology of the DJP films, yielding more efficient and stable solar cells than the control device. They behave quite differently in modifying the morphological features. Particularly, EASCN outstands the additives in terms of the superior morphology, which is compact and uniform and consists of the largest flaky grains. Consequently, the corresponding device delivers a power conversion efficiency (PCE) of 15.27% and maintains ≈86% of the initial PCE after aging in the air for 182 h. Conversely, MASCN as an additive produces uneven DJP film and the device maintains only 46% of the initial PCE. PASCN as an additive produces the finest grains in the DJP film, and the corresponding device yields a PCE of 11.95%. From the economical point of view, it costs 0.0025 yuan per device for the EASCN additive, allowing for cost-effective perovskite solar cells.

Keywords: alkyl chains; alkylammonium pesudohalide additives; microstructures; optoelectronic properties; perovskite solar cells.

Abstract

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