化学学报 ›› 2015, Vol. 73 ›› Issue (3): 267-271.DOI: 10.6023/A14100721 上一篇    下一篇

所属专题: 新型太阳能电池

研究论文

薄膜结构及形貌对钙钛矿电池性能的影响

邵志鹏a, 潘旭a, 张旭辉a, 叶加久a, 朱梁正a, 李毅a, 马艳梅a, 黄阳a, 朱俊a, 胡林华a, 孔凡太a, 戴松元a,b   

  1. a 中国科学院等离子体物理研究所 新型薄膜太阳电池重点实验室 合肥 230031;
    b 华北电力大学 新型薄膜太阳电池北京市重点实验室 北京 102206
  • 收稿日期:2014-10-17 出版日期:2015-03-14 发布日期:2014-12-25
  • 通讯作者: 潘旭, 戴松元 E-mail:sydai@ipp.ac.cn;mars_dark@hotmail.com
  • 基金资助:

    项目受国家973计划(No. 2011CBA00700)、国家863计划(No. 2011AA050510)和国家自然科学基金(Nos. 21103197, 21273242)资助.

Influence of Structure and Morphology of Perovskite Films on the Performance of Perovskite Solar Cells

Shao Zhipenga, Pan Xua, Zhang Xuhuia, Ye Jiajiua, Zhu Liangzhenga, Li Yia, Ma Yanmeia, Huang Yanga, Zhu Juna, Hu Linhuaa, Kong Fantaia, Dai Songyuana,b   

  1. a Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031;
    b Beijing Key Laboratory of Novel Thin Film Solar Cells, North China Electric Power University, Beijing, 102206
  • Received:2014-10-17 Online:2015-03-14 Published:2014-12-25
  • Supported by:

    Project supported by the National Basic Research Program of China (No. 2011CBA00700), the National High Technology Research and Development Program of China (No. 2011AA050510), and the National Natural Science Foundation of China (Nos. 21103197, 21273242).

采用液相连续沉积法制备了有机/无机杂化钙钛矿太阳电池, 并研究了不同形貌钙钛矿(CH3NH3PbI3)光活性层对太阳电池性能的影响. 实验结果表明在连续沉积法中PbI2的结构对CH3NH3PbI3层的形貌具有重要的影响, PbI2薄膜中适当的孔洞结构有利于其与CH3NH3I充分反应形成CH3NH3PbI3层. 致密的PbI2层造成PbI2的转化不完全, 导致CH3NH3PbI3颗粒较小, 吸收较弱, 影响电池的短路电流. 而CH3NH3PbI3颗粒过大会引起CH3NH3PbI3薄膜孔洞产生, 造成电池的开路电压下降. 通过对电池制备工艺的优化获得了13.5%的最佳光电转换效率.

关键词: 有机/无机杂化, 钙钛矿, 制备工艺, 形貌, 太阳电池

Perovskite solar cells based on the inorganic/organic hybrid perovskite have attracted increasing attention over the past 3 years. Many studies have been done in this area. Controling the morphology of the perovskite film is an effective way to improve the photoelectric conversion efficiency of the devices. In our reserch, we studied the influence of structure and morphology of perovskite films on the performance of the organic-inorganic hybrid perovskite solar cells which prepared by a sequential deposition method. Mesoporous TiO2 scaffold were introduced as electron collecting layer. Lead iodide (PbI2) was then spin cast on the TiO2 scaffold. The PbI2 subsequently transformed into the perovskite (CH3NH3PbI3) by dipping the TiO2/PbI2 film into a solution of CH3NH3I. We studied the difference between the PbI2 film with or without drying under room temperature after spin-coating. Through drying under room temperature, larger pores formed in the PbI2 film. While without drying under room temperature, smaller and shallower pores formed in the PbI2 film. The results show that larger pores in PbI2 film leads to more complete transformation of PbI2 to CH3NH3PbI3 and larger CH3NH3PbI3 particles. CH3NH3PbI3 films were prepared with three different processes: (a) direct dipping the PbI2 film with smaller pores into the CH3NH3I solution; (b) direct dipping the PbI2 with larger pores into the CH3NH3I solution; (c) dipping the PbI2 with larger pores into the CH3NH3I solution after pre-wetting.The resulting CH3NH3PbI3 films were studied with SEM, UV-vis absorption spectrum and XRD. The particles size of the CH3NH3PbI3 are 150, 250 and 350 nm for process (a), (b) and (c) respectively. CH3NH3PbI3 films fabricated through process (a) show insufficient absorption due to the insufficient transformation of the PbI2. The pre-wetting procedure leads to slower reaction result in larger CH3NH3PbI3 particle size. Devices with proper size of CH3NH3PbI3 particles show the highest photoelectric conversion efficiency. An efficiency of 13.5% was achieved with a Jsc of 17.8 mA/cm2, a Voc of 1.05 V and a FF of 72.5%.

Key words: organic/inorganic hybrid, perovskite, preparation process, morphology, solar cell