Improved Interface Charge Extraction by Double Electron Transport Layers for High-Efficient Planar Perovskite Solar Cells
Improved Interface Charge Extraction by Double Electron Transport Layers for High-Efficient Planar Perovskite Solar Cells
复制标题
通过双电子传输层改善高效平面钙钛矿太阳能电池的界面电荷提取
DOI：
10.1002/solr.201900314
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发表时间：
2019-09-19
期刊：
影响因子：
7.9
通讯作者：
Zhang, Yu
中科院分区：
文献类型：
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作者：
Gao, Yanbo;Wu, Yanjie;Zhang, Yu
电子传输层（ETL）的电荷提取对于提高钙钛矿太阳能电池（PSC）的性能起着至关重要的作用。在这里，与四种不同类型的ETL，如SnO 2，amorphous-Zn 2SnO 4（am-ZTO），am-ZTO/SnO 2，和SnO 2/am-ZTO，PSC成功地合成。系统地研究了四种ETL对器件界面复合行为和电荷输运特性的影响。对于双am-ZTO/SnO 2 ETL，通过脉冲激光沉积方法制备的紧凑的am-ZTO ETL提供了比旋涂膜更致密的与FTO的物理接触，降低了ETL/FTO界面处的漏电流并改善了电荷收集。此外，双am-ZTO/SnO 2 ETL导致大的自由能差（Δ G），改善了从钙钛矿到ETL的电子注入。形成了从钙钛矿到am-ZTO的一个额外的电子路径，这也可以提高电子注入效率。基于双am-ZTO/SnO 2 ETL的器件的功率转换效率为20.04%，稳定效率为19.17%。最重要的是，这些器件是在150摄氏度的低温下制造的，这为大规模生产PSC提供了一种潜在的方法，并为柔性PSC的开发铺平了道路。本研究为通过控制Δ G和界面接触来设计ETL以提高PSC的性能提供了一种策略。
Charge extraction by electron transport layers (ETLs) plays a vital role in improving the performance of perovskite solar cells (PSCs). Here, PSCs with four different types of ETLs, such as SnO2, amorphous-Zn2SnO4 (am-ZTO), am-ZTO/SnO2, and SnO2/am-ZTO, are successfully synthesized. The interface recombination behavior and the charge transport properties of the devices affected by four types of ETLs are systematically investigated. For dual am-ZTO/SnO2 ETLs, compact am-ZTO ETL prepared by the pulsed laser deposition method provides a dense physical contact with FTO than the spin coating films, decreasing leakage current and improving charge collection at the interface of ETL/FTO. Moreover, dual am-ZTO/SnO2 ETLs lead to large free energy difference (Delta G), improving electron injection from perovskite to ETLs. One additional electron pathway from perovskite to am-ZTO is formed, which can also improve electron injection efficiency. A power conversion efficiency of 20.04% and a stabilized efficiency of 19.17% are achieved for the device based on dual am-ZTO/SnO2 ETLs. Most importantly, the devices are fabricated at a low temperature of 150 degrees C, which offers a potential method for large-scale production of PSCs, and paves the way for the development of flexible PSCs. It is believed that this work provides a strategy to design ETLs via controlling Delta G and interface contact to improve the performance of PSCs.