Effects of interfacial characteristics on photovoltaic performance in CH3NH3PbBr3-based bulk perovskite solar cells with core/shell nanoarray as electron transporter
Effects of interfacial characteristics on photovoltaic performance in CH3NH3PbBr3-based bulk perovskite solar cells with core/shell nanoarray as electron transporter
复制标题
界面特性对以核/壳纳米阵列为电子传输体的CH3NH3PbBr3基钙钛矿太阳能电池光伏性能的影响
DOI：
10.1016/j.nanoen.2014.12.004
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发表时间：
2015-03-01
期刊：
影响因子：
17.6
通讯作者：
Wang, Mingtai
中科院分区：
文献类型：
--
作者：
Liu, Changwen;Qiu, Zeliang;Wang, Mingtai
首次制备了以CH 3 NH3 PbBr 3为基质的以核/壳纳米阵列为电子传输体的钙钛矿太阳能电池，在AM1.5（100 mW/cm 2）光照下，电池的转换效率达到4.31%.结果表明，CH 3 NH3 PbBr 3/纳米阵列器件的开路电压由ZnO芯的导带与CH 3 NH3 PbBr 3的最高占据分子轨道之间的差决定，但与ZnO中的电子和CH 3 NH3 PbBr 3中的空穴的准费米能级密切相关;热退火是通过增加电荷产生和减少界面电荷复合来提高器件短路电流密度的有效方法。在CH 3 NH3 PbBr 3/nanoarray器件中，界面特性对器件性能至关重要，主要体现在CdS壳层的存在，它提供了额外的吸收贡献，钝化了ZnO表面缺陷，减少了界面电荷复合，消除了热退火处理过程中CH 3 NH3 PbBr 3在ZnO表面的分解，提高了钙钛矿结晶度，增加了光电流。我们的主要研究结果有望为设计有效的界面提供指导，以实现高效钙钛矿太阳能电池中光生载流子的空间分离。(C)2014爱思唯尔有限公司版权所有。
CH3NH3PbBr3-based bulk perovskite solar cells with core/shell nanoarray as electron transporter are fabricated for the first time, and an efficiency of 4.31% under AM 1.5 illumination (100 mW/cm 2) was achieved. It is found that the open-circuit voltage in the CH3NH3PbBr3/nanoarray devices is determined by the difference between the conduction band of ZnO core and the highest occupied molecular orbital of CH3NH3PbBr3, but significantly correlates with the quasi-Fermi levels of the electrons in ZnO and the holes in CH3NH3PbBr3; thermal annealing is an effective way to enhance the device short-circuit current density by increasing charge generation and reducing interfacial charge recombination. In the CH3NH3PbBr3/nanoarray devices, interfacial characteristics are vitally important to the device performance, which is mainly embodied by the existing CdS shell that provides additional absorption contribution, passivates ZnO surface defects, reduces interfacial charge recombination, and eliminates the decomposition of CH3NH3PbBr3 on ZnO surface during the thermal annealing treatment for improving perovskite crystallinity to increase photocurrent. Our major findings are expected to provide a guide to design the effective interfaces for spatial separation of photogenerated charge carriers in efficient perovskite solar cells. (C) 2014 Elsevier Ltd. All rights reserved.