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Enhanced Photovoltaic Performance of the Inverted Planar Perovskite Solar Cells by Using Mixed-Phase Crystalline Perovskite Film with Trace Amounts of PbI2 as an Absorption Layer
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-10-04 00:00:00 , DOI: 10.1021/acs.jpcc.7b04338 Deng-Hao Ma 1 , Wei-Jia Zhang 1 , Zhao-Yi Jiang 1 , Deng-Yuan Song 2 , Lei Zhang 2 , Wei Yu 3
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-10-04 00:00:00 , DOI: 10.1021/acs.jpcc.7b04338 Deng-Hao Ma 1 , Wei-Jia Zhang 1 , Zhao-Yi Jiang 1 , Deng-Yuan Song 2 , Lei Zhang 2 , Wei Yu 3
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It is widely known that solvent engineering has a significant effect on the growth of high quality perovskite film. However, the crystal evolution process and crystal compositions of perovskite film when applying the two-step method are multifaceted, and the effects on the photoelectrical properties for the perovskite layer still require further study. In this study, the above two issues are systematically studied. Combining the XRD and photoluminescence spectra results, it was observed that the residual PbI2 decreased with the increase of DMSO in DMSO/DMF solvents and that there were two types of local phase crystallites (disordered and ordered) in the perovskite films. The phase transitions of the crystals were investigated with the ratio of DMSO increasing in the mixed solvents. In addition, the interfacial defect states in the PbI2/perovskite interface which can act as charge carrier trapping centers were significantly affected by the photo(dark) conductivity of the perovskite film. It was also observed that the photoconductivity of the perovskite film with the DMSO 30%, which contains mixed-phase (ordered/disordered) crystals and trace amounts of PbI2, was higher than the film with DMSO 60%. Finally, a high power conversion efficiency of 16.5% with trace amounts of PbI2 was achieved when the volume ratio of the DMSO was 30%.
中文翻译：
通过使用痕量PbI 2的混合相结晶钙钛矿薄膜作为吸收层，增强了倒置平面钙钛矿太阳能电池的光伏性能。
众所周知，溶剂工程对高质量钙钛矿薄膜的生长具有重大影响。然而，采用两步法时钙钛矿薄膜的晶体演化过程和晶体组成是多方面的，对钙钛矿层光电性能的影响尚需进一步研究。在本研究中，对上述两个问题进行了系统地研究。结合XRD和光致发光光谱结果，观察到残留的PbI 2随着DMSO / DMF溶剂中DMSO的增加而降低，钙钛矿薄膜中存在两种类型的局部相微晶（无序和有序）。随着混合溶剂中DMSO比例的增加，研究了晶体的相变。此外，钙钛矿膜的光（暗）电导率显着影响了PbI 2 /钙钛矿界面中的界面缺陷状态，该界面缺陷状态可以作为电荷载流子的俘获中心。还观察到，具有30％DMSO的钙钛矿薄膜的光电导率高于具有60％DMSO的钙钛矿薄膜的光电导性，该DMSO包含混合相（有序/无序）晶体和痕量的PbI 2。最后，痕量的PbI 2具有16.5％的高功率转换效率 当DMSO的体积比为30％时，可达到最佳效果。
更新日期：2017-10-04
中文翻译：
通过使用痕量PbI 2的混合相结晶钙钛矿薄膜作为吸收层，增强了倒置平面钙钛矿太阳能电池的光伏性能。
众所周知，溶剂工程对高质量钙钛矿薄膜的生长具有重大影响。然而，采用两步法时钙钛矿薄膜的晶体演化过程和晶体组成是多方面的，对钙钛矿层光电性能的影响尚需进一步研究。在本研究中，对上述两个问题进行了系统地研究。结合XRD和光致发光光谱结果，观察到残留的PbI 2随着DMSO / DMF溶剂中DMSO的增加而降低，钙钛矿薄膜中存在两种类型的局部相微晶（无序和有序）。随着混合溶剂中DMSO比例的增加，研究了晶体的相变。此外，钙钛矿膜的光（暗）电导率显着影响了PbI 2 /钙钛矿界面中的界面缺陷状态，该界面缺陷状态可以作为电荷载流子的俘获中心。还观察到，具有30％DMSO的钙钛矿薄膜的光电导率高于具有60％DMSO的钙钛矿薄膜的光电导性，该DMSO包含混合相（有序/无序）晶体和痕量的PbI 2。最后，痕量的PbI 2具有16.5％的高功率转换效率 当DMSO的体积比为30％时，可达到最佳效果。
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