Thin Films of Tin Oxide Nanosheets Used as the Electron Transporting Layer for Improved Performance and Ambient Stability of Perovskite Photovoltaics
Thin Films of Tin Oxide Nanosheets Used as the Electron Transporting Layer for Improved Performance and Ambient Stability of Perovskite Photovoltaics
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DOI：
10.1002/solr.201700117
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发表时间：
2017-11-01
期刊：
影响因子：
7.9
通讯作者：
Caruso, Rachel A.
中科院分区：
文献类型：
--
作者：
Wu, Wu-Qiang;Chen, Dehong;Caruso, Rachel A.
具有定制纳米结构的无机半导体金属氧化物电子传输层（ETL）具有产生具有改善的稳定性和降低的滞后的高效钙钛矿太阳能电池（PSC）的潜力。在这里，一个简单而方便的水热协议的结晶SnO 2纳米片（SNS）薄膜具有优异的光学和光电性能的生长证明。当作为ETL应用时，SNS增强了光捕获，促进了电荷收集，减少了滞后并提高了环境稳定性。此外，通过引入C-60中间层优化SNS和钙钛矿层之间的界面性质导致更好的能级对准，减少电荷复合，从而延长电子寿命并提高开路电压（V-oc）。因此，基于C-60改性的SNS ETL的高效常规n-i-p PSC具有几乎无干扰的行为，冠军功率转换效率PCE为18.31%，并且稳定PCE超过18.00%。在室温下储存500 h后，未封装的SNS基PSC表现出相当的环境稳定性，保持其初始效率的90%以上。这种强大的SNS ETL为低成本和稳定的PSC铺平了道路，这些PSC具有高效率，低滞后和长期稳定性。
Inorganic semiconducting metal oxide electron transporting layers (ETLs) with tailored nanostructures have the potential to yield efficient perovskite solar cells (PSCs) with improved stability and reduced hysteresis. Here, a simple and facile hydrothermal protocol is demonstrated for the growth of crystalline SnO2 nanosheet (SNS) thin films with excellent optical and photoelectrical properties. When applied as ETLs, the SNS enhances light harvesting, boosts charge collection, reduces hysteresis and improves the ambient stability. Moreover, optimization of the interfacial properties between the SNS and the perovskite layer by the introduction of a C-60 interlayer results in better energy level alignment, decreasing charge recombination and thus prolonging the electron lifetime and improving the open-circuit voltage (V-oc). Therefore, the efficient conventional n-i-p PSCs based on C-60-modified SNS ETLs have almost hysteresis-free behavior, with a champion power conversion efficiency, PCE, of 18.31% and a stabilized PCE over 18.00%. The SNS-based PSC exhibits respectable ambient stability retaining over 90% of its initial efficiency after being stored in air at room temperature for 500h without encapsulation. Such robust SNS ETLs pave the way to low-cost and stable PSCs with high efficiency, less hysteresis, and long-term stability.