Insight into the CH3NH3PbI3/C interface in hole-conductor-free mesoscopic perovskite solar cells.
Insight into the CH3NH3PbI3/C interface in hole-conductor-free mesoscopic perovskite solar cells.
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DOI：
10.1039/c6nr03359h
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发表时间：
2016-07
期刊：
影响因子：
6.7
通讯作者：
Jiangwei Li;Guangda Niu;Wenzhe Li;K. Cao;Mingkui Wang;Liduo Wang
中科院分区：
文献类型：
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作者：
Jiangwei Li;Guangda Niu;Wenzhe Li;K. Cao;Mingkui Wang;Liduo Wang
具有无空穴导体介观结构的超导太阳能电池（PSCs）显示出极高的稳定性和巨大的应用潜力。可印刷碳对电极完全负责从活性CH 3 NH3 PbI 3吸收剂中提取空穴。然而，在CH 3 NH3 PbI 3/C界面特性，如结构形成过程和界面条件对空穴提取的影响，仍然缺乏深入的研究。在此，我们提出，为第一次，洞察空间限制诱导CH 3 NH3 PbI 3/C界面的形成过程中的CH 3 NH3 PbI 3的结晶过程中的原位光致发光观察。导出的反应动力学允许定量描述的钙钛矿形成过程。此外，我们发现碳和钙钛矿之间的界面接触是占主导地位的空穴提取效率和相关的光伏参数的短路电流密度（JSC）。因此，我们进行了溶剂蒸气辅助的PbI 2扩散过程，以小心地控制CH 3 NH3 PbI 3/C界面，具有较少的未反应的PbI 2阻挡层。界面条件的改善，从而有助于一个高的空穴提取证明了电荷提取电阻和PL寿命的变化，导致增加的JSC阀。
Perovskite solar cells (PSCs) with hole-conductor-free mesoscopic architecture have shown superb stability and great potential in practical application. The printable carbon counter electrodes take full responsibility of extracting holes from the active CH3NH3PbI3 absorbers. However, an in depth study of the CH3NH3PbI3/C interface properties, such as the structural formation process and the effect of interfacial conditions on hole extraction, is still lacking. Herein, we present, for the first time, an insight into the spatial confinement induced CH3NH3PbI3/C interface formation by in situ photoluminescence observations during the crystallization process of CH3NH3PbI3. The derived reaction kinetics allows a quantitative description of the perovskite formation process. In addition, we found that the interfacial contact between carbon and perovskite was dominant for hole extraction efficiency and associated with the photovoltaic parameter of short circuit current density (JSC). Consequently, we conducted a solvent vapor assisted process of PbI2 diffusion to carefully control the CH3NH3PbI3/C interface with less unreacted PbI2 barrier. The improvement of interface conditions thereby contributes to a high hole extraction proved by the charge extraction resistance and PL lifetime change, resulting in the increased JSC valve.