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Correlating Photovoltaic Performance of Dye-Sensitized Solar Cell to the Film Thickness of Titania via Numerical Drift-Diffusion Simulations
Yu-dan Wang,Zhe Sun,Ya-jun Ren,Yan Zhang,Mao Liang,Song Xue
Author NameAffiliationE-mail
Yu-dan Wang Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China  
Zhe Sun Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China zhesun@tjut.edu.cn 
Ya-jun Ren School of Electric Engineering, Tianjin University of Technology, Tianjin 300384, China  
Yan Zhang Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China  
Mao Liang Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China  
Song Xue Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China xuesong@ustc.edu.cn 
Abstract:
The thickness of TiO2 film is vital to realize the optimization on photovoltaic performance of dye sensitized solar cells (DSSCs). Herein, the process of charge separation in DSSCs was simulated by using a drift-diffusion model. This model allows multiple-trapping diffusion of photo-generated electrons, as well as the back reaction with the electron acceptors in electrolyte, to be mimicked in both steady and non-steady states. Numerical results on current-voltage characteristics allow power conversion efficiency to be maximized by varying the thickness of TiO2 film. Charge collection efficiency is shown to decrease with film thickness, whereas the flux of electron injection benefits from the film thickening. The output of photocurrent is actually impacted by the two factors. Furthermore, recombination rate constant is found to affect the optimized film thickness remarkably. Thicker TiO2 film is suitable to the DSSCs in which back reaction is suppressed sufficiently. On the contrary, the DSSCs with the redox couple showing fast electron interception require thinner film to alleviate the charge loss via recombination. At open circuit, electron density is found to decrease with film thickness, which engenders not only the reduction of photovoltage but also the increase of electron lifetime.
Key words:  Dye-sensitized solar cells  Titania  Film thickness  Simulation
FundProject:
关联染料敏化太阳能电池薄膜厚度与光伏性能的漂移-扩散数值模拟
王玉丹,孙喆,任亚君,张艳,梁茂,薛松
摘要:
建立漂移-扩散模型来模拟敏化电池的电荷分离过程.该模型能够计算在稳态和非稳态条件下光生电子的多步受限扩散及其与电子受体的复合反应.通过对电池的电流-电压曲线的数值模拟,优化了电池的薄膜厚度并获得了最大的光电转换效率.发现膜厚的增加降低了电荷收集效率,但有利于提高电子注入流率,光电流的输出正是受控于这两个因素.复合速率常数严重影响了膜厚优化的结果.较厚的薄膜适合于电子复合被充分抑制的电池,而较薄的薄膜有利于降低快复合电池的电子复合损失.在开路条件下,膜厚的提高会减小电子浓度,在造成光电压的降低的同时会提高电子寿命.
关键词:  染料敏化太阳能电池  模拟  扩散方程  电子寿命  数值方法
DOI:10.1063/1674-0068/29/cjcp1604090
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