Highly Efficient Perovskite Solar Cells with Gradient Bilayer Electron Transport Materials
Highly Efficient Perovskite Solar Cells with Gradient Bilayer Electron Transport Materials
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具有梯度双层电子传输材料的高效钙钛矿太阳能电池
DOI：
10.1021/acs.nanolett.8b01440
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发表时间：
2018-06-01
期刊：
影响因子：
10.8
通讯作者：
Wang, Mingkui
中科院分区：
文献类型：
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作者：
Gong, Xiu;Sun, Qiang;Wang, Mingkui
电子传输层（ETL）具有合适的能级排列以促进电荷载流子传输以及电子提取，对于平面异质结钙钛矿太阳能电池（PSC）实现高开路电压（V-oc）和短路电流是必不可少的。在此，我们系统地研究了ETL和钙钛矿吸收体之间的带偏移，通过调整F掺杂水平在SnO 2晶体。我们证明，逐步取代F-到SnO 2 ETL可以有效地减少带偏移，并导致在器件的V-OC大幅增加。因此，在AM 1.5 G照明下，使用F掺杂的SnO 2双层ETL的平面异质结PSC的功率转换效率为20.2%，V-oc为1.13 V。我们的发现提供了一种简单的途径来定制ETL/钙钛矿带偏移，以增加平面异质结PSC的内置电场，从而同时最大化V-oc和电荷收集。
Electron transport layers (ETLs) with suitable energy level alignment for facilitating charge carrier transport as well as electron extraction are essential for planar heterojunction perovskite solar cells (PSCs) to achieve high open-circuit voltage (V-oc) and short-circuit current. Herein we systematically investigate band offset between ETL and perovskite absorber by tuning F doping level in SnO2 nanocrystal. We demonstrate that gradual substitution of F- into the SnO2 ETL can effectively reduce the band offset and result in a substantial increase in device V-oc. Consequently, a power conversion efficiency of 20.2% with V-oc of 1.13 V can be achieved under AM 1.5 G illumination for planar heterojunction PSCs using F-doped SnO2 bilayer ETL. Our finding provides a simple pathway to tailor ETL/perovskite band offset to increase built-in electric field of planar heterojunction PSCs for maximizing V-oc and charge collection simultaneously.