Citation: 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 Chimica Sinica, ;2019, 77(6): 545-550. doi: 10.6023/A19020058 shu

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

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

Corresponding author: Wu Wenjun, wjwu@ecust.edu.cn
Received Date: 3 February 2019
Available Online: 9 June 2019
Fund Project: the Scientific Committee of Shanghai 18160723400the National Natural Science Foundation of China 21676087Project supported by the National Natural Science Foundation of China (No. 21676087) and the Scientific Committee of Shanghai (No. 18160723400)

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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.
- perovskite precursors,
- dimethylammonium iodide,
- photocurrent,
- dispersions
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