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Improved Performance of Carbon Electrode Perovskite Solar Cells Using Urea Treatment in Two‐Step Processing
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-02-06 , DOI: 10.1002/cnma.201900681
Tingting Xu 1, 2 , Xuelin Sun 1 , Weiwei Cao 1 , Xiulan Qin 1 , Ashim Gurung 3 , Shaoshen Lv 2 , Yonghua Chen 2, 4 , Lixin Chen 1 , Wei Huang 2 , Qiquan Qiao 3
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Perovskite solar cell has made a steady research progress with superior photovoltaic power conversion efficiency (PCE) over 25%. The quality of perovskite film is a key factor affecting device efficiency. Lewis bases such as urea, DMSO and thiourea etc. have been applied in perovskite precursor solutions for one step processing to effectively control the film morphology. Herein, we report urea treatment in a two‐step processing for obtaining high quality methylammonium lead triiodide perovskite (CH3NH3PbI3) film, which is accomplished by immersing the PbI2 film into the mixture solution of urea/methylammonium iodide (MAI). The optimized urea concentration in the MAI solution is 0.4 mg/mL, leading to larger‐sized and better crystalline perovskite grains than that without urea additive. The main function of the urea additive is the formation of the adduct MAI⋅PbI2⋅O=C(NH2)2, retarding the crystallization process of the perovskite film. The steady‐state and time‐resolved photoluminescence measurements revealed that perovskite CH3NH3PbI3 grown using optimized concentration of urea has prolonged carrier lifetime and reduced carrier recombination. Finally, the carbon‐based perovskite solar cells fabricated from the optimal urea concentration of 0.4 mg/mL achieved the enhanced photovoltaic performance with the highest PCE of 13.10% and an average value of 11.34%, in comparison to devices without urea treatment exhibiting an average PCE of only 8.67%.

中文翻译:

在两步处理中使用尿素处理改善碳电极钙钛矿太阳能电池的性能

钙钛矿型太阳能电池取得了稳定的研究进展,其光电转换效率(PCE)超过25%。钙钛矿薄膜的质量是影响器件效率的关键因素。路易斯碱(如尿素,DMSO和硫脲等)已应用于钙钛矿前体溶液中,用于一步加工以有效控制膜的形态。在这里,我们报告尿素分两步处理以获得高质量的甲基铵三碘化钙钛矿(CH 3 NH 3 PbI 3)膜,这是通过将PbI 2浸渍来完成的。膜成尿素/甲基碘化铵(MAI)的混合溶液。MAI溶液中的最佳尿素浓度为0.4 mg / mL,与不含尿素添加剂的尿素相比,可产生更大尺寸和更好的结晶钙钛矿晶粒。尿素添加剂的主要功能是形成加合物MAI·PbI O = C(NH 22,从而阻碍钙钛矿薄膜的结晶过程。稳态和时间分辨光致发光测量表明钙钛矿CH 3 NH 3 PbI 3使用最佳浓度的尿素培养的大豆可以延长载体寿命并减少载体重组。最后,与未进行尿素处理的装置显示出平均水平相比,由最佳尿素浓度为0.4 mg / mL制成的碳基钙钛矿太阳能电池获得了增强的光伏性能,最高PCE为13.10%,平均值为11.34%。 PCE仅为8.67%。
更新日期:2020-02-06
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