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A low-temperature TiO 2 /SnO 2 electron transport layer for high-performance planar perovskite solar cells
Science China Materials ( IF 6.8 ) Pub Date : 2019-09-18 , DOI: 10.1007/s40843-019-9586-x
Nan Li , Jin Yan , Yuqian Ai , Ershuai Jiang , Liujin Lin , Chunhui Shou , Baojie Yan , Jiang Sheng , Jichun Ye

Conventional titanium oxide (TiO2) as an electron transport layer (ETL) in hybrid organic-inorganic perovskite solar cells (PSCs) requires a sintering process at a high temperature to crystalize, which is not suitable for flexible PSCs and tandem solar cells with their low-temperature-processed bottom cell. Here, we introduce a low-temperature solution method to deposit a TiO2/tin oxide (SnO2) bilayer towards an efficient ETL. From the systematic measurements of optical and electronic properties, we demonstrate that the TiO2/SnO2 ETL has an enhanced charge extraction ability and a suppressed carrier recombination at the ETL/perovskite interface, both of which are beneficial to photo-generated carrier separation and transport. As a result, PSCs with TiO2/SnO2 bilayer ETLs present higher photovoltaic performance of the baseline cells compared with their TiO2 and SnO2 single-layer ETL counterparts. The champion PSC has a power conversion efficiency (PCE) of 19.11% with an open-circuit voltage (Voc) of 1.15 V, a short-circuit current density (Jsc) of 22.77 mA cm−2, and a fill factor (FF) of 72.38%. Additionally, due to the suitable band alignment of the TiO2/SnO2 ETL in the device, a high Voc of 1.18 V is achieved. It has been proven that the TiO2/SnO2 bilayer is a promising alternative ETL for high efficiency PSCs.



中文翻译:

用于高性能平面钙钛矿太阳能电池的低温TiO 2 / SnO 2电子传输层

混合有机-无机钙钛矿太阳能电池(PSC)中作为电子传输层(ETL)的常规二氧化钛(TiO 2)需要高温下的烧结过程才能结晶,这不适用于柔性PSC和串联式太阳能电池。低温处理的底部电池。在这里,我们介绍了一种低温溶液法,以向高效ETL沉积TiO 2 /氧化锡(SnO 2)双层。通过光学和电子性质的系统测量,我们证明了TiO 2 / SnO 2ETL具有增强的电荷提取能力,并且在ETL /钙钛矿界面处的载流子重组受到抑制,这两者都有利于光生载流子的分离和运输。结果,与它们的TiO 2和SnO 2单层ETL对应物相比,具有TiO 2 / SnO 2双层ETL的PSC表现出更高的基线电池光伏性能。冠军PSC的功率转换效率(PCE)为19.11%,开路电压(V oc)为1.15 V,短路电流密度(J sc)为22.77 mA cm -2,填充系数为( FF)为72.38%。此外,由于TiO具有合适的能带取向设备中的2 / SnO 2 ETL可以实现1.18 V的高V oc。已经证明,TiO 2 / SnO 2双层是高效PSC的有希望的替代ETL。

更新日期:2019-09-18
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