Dimethylammonium Iodide: Boosting Photocurrent for Dye-sensitized Solar Cells with Perovskite Precursors Electrolyte

doi:10.6023/A19020058

Acta Chim. Sinica ›› 2019, Vol. 77 ›› Issue (6): 545-550.DOI: 10.6023/A19020058 Previous Articles Next Articles

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N,N-二甲基碘化铵:染料敏化太阳能电池钙钛矿前驱体电解质的#br# 高效添加剂

武文俊, 信成浩, 逄智涵, 徐梁, 李晨

华东理工大学化学与分子工程学院结构可控先进功能材料及其制备教育部重点实验室上海 200237

投稿日期:2019-02-03 发布日期:2019-05-10
通讯作者: 武文俊 E-mail:wjwu@ecust.edu.cn
基金资助:
项目受国家自然科学基金面上项目（No.21676087）和上海市国际合作交流项目（No.18160723400）资助.

Dimethylammonium Iodide: Boosting Photocurrent for Dye-sensitized Solar Cells with Perovskite Precursors Electrolyte

Wu Wenjun, Xin Chenghao, Pang Zhihan, Xu Liang, Li Chen

Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science & Technology, Shanghai 200237, China

Received:2019-02-03 Published:2019-05-10
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21676087) and the Scientific Committee of Shanghai (No. 18160723400).

1. Dimethylammonium Iodide: Boosting Photocurrent for Dye-sensitized Solar Cells with Perovskite Precursors Electrolyte.PDF(520KB)

Abstract

As a typical representative of the third-generation solar cell, the dye-sensitized solar cells (DSSCs) with iodine electrolyte have attracted much attention due to its low fabrication cost, simple assembly process and relatively high photoelectric conversion efficiency (PCE). However, all studies about electrolytes are essentially related to redox couples of iodine, cobalt and copper with different chemical valences by far. Based on above systems, it is difficult to continually enhance the photocurrent of DSSCs due to the energy level tunability limitation between the redox potential and the dye regeneration. However, the study of perovskite precursor (PbI₂ and CH₃NH₃I) as dye-sensitized solar cell electrolyte has just started, and its specific mechanism is still unclear. As the newly-presented electrolyte of dye-sensitized solar cells, its development bottleneck of photocurrent and photovoltage is an urgent issue to be solved. Herein, dimethylammonium iodide (DMAI) was introduced as a high-efficiency additive for the perovskite precursors electrolyte and the photocurrent is sharply increased from 12.85 mA·cm^-2 to 19.19 mA·cm^-2. The electron transfer process was preliminary studied in this system via chemical capacitance, electron lifetime, charge transfer impedance, and Tafel curve. The Tafel curve test is based on the dummy cell with Pt|electrolyte|Pt device structure, and the others on the completed cells. In particular, the results of chemical capacitance show that the addition of DMAI obviously leads to the upward shift of the TiO₂ conduction band. It is found that the increase in photocurrent is attributed to the inhibition of the electron recombination caused by unbalanced carriers due to the upward shift of the TiO₂ semiconductor conduction band. By the modulation action of tert-butylpyridine (TBP), the photoelectric conversion efficiency was increased to 8.46% over the iodine system. It lays a solid foundation for the expansion of the dye-sensitized solar cell electrolyte system, the sustainable improvement of its performance and future application.

Key words: perovskite precursors, dimethylammonium iodide, photocurrent, dispersions

Cite this article

Wu Wenjun, Xin Chenghao, Pang Zhihan, Xu Liang, Li Chen. Dimethylammonium Iodide: Boosting Photocurrent for Dye-sensitized Solar Cells with Perovskite Precursors Electrolyte[J]. Acta Chim. Sinica, 2019, 77(6): 545-550.

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N,N-二甲基碘化铵:染料敏化太阳能电池钙钛矿前驱体电解质的#br# 高效添加剂

Dimethylammonium Iodide: Boosting Photocurrent for Dye-sensitized Solar Cells with Perovskite Precursors Electrolyte

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