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High‐Efficiency Low‐Temperature‐Processed Mesoscopic Perovskite Solar Cells from SnO2 Nanorod Self‐Assembled Microspheres
Solar RRL ( IF 7.9 ) Pub Date : 2020-01-30 , DOI: 10.1002/solr.201900558
Jing Song 1 , Guodong Li 1 , Deng Wang 1 , Weihai Sun 1 , Jihuai Wu 1 , Zhang Lan 1
Affiliation  

Mesoporous scaffolds in perovskite solar cells (PSCs) can accelerate the formation of heterogeneous nucleation sites, leading to enhanced quality of perovskite films and uniform perovskite coverage over large areas. Nevertheless, the mesoporous electron transport layers (ETLs) can effectively compensate for the drawback of shorter electron diffusion lengths than their hole counterparts. Therefore, most mesoscopic PSCs usually show superior photovoltaic performance to their planar counterparts. However, mesoporous ETLs, particularly those prepared with metal oxide nanocrystals, often require a high‐temperature sintering process for the removal of residual organics and the improved crystallization of metal oxides. Here, a novel emulsion‐based bottom‐up self‐assembly strategy is used to prepare sizable SnO2 microspheres from oleic acid capped SnO2 nanorods. Combined with an in‐situ ligand‐stripping strategy, the low‐temperature solution‐processed mesoscopic PSCs can achieve efficiency as high as 21.35% with slight hysteresis and good reproducibility. In particular, the emulsion‐based bottom‐up self‐assembly strategy is a general way for preparing microspheres from several kinds of semiconductor nanocrystals, so it will greatly expand the material selection range for preparing efficient mesoscopic PSCs and even inverted mesoscopic devices.

中文翻译:

SnO2纳米棒自组装微球的高效低温加工介观钙钛矿型太阳能电池

钙钛矿太阳能电池(PSC)中的介孔支架可以加速异质形核位点的形成,从而提高钙钛矿薄膜的质量并在大面积上均匀地覆盖钙钛矿。然而,中孔电子传输层(ETL)可以有效地弥补比其空穴对应物短的电子扩散长度的缺点。因此,大多数介观的PSC通常显示出优于其平面同类产品的光伏性能。然而,介孔ETL,特别是那些用金属氧化物纳米晶体制备的ETL,通常需要高温烧结工艺以去除残留的有机物并改善金属氧化物的结晶。在这里,一种基于乳液的新型自下而上的自组装策略用于制备可观的SnO 2油酸封盖的SnO 2纳米棒形成微球。结合原位配体剥离策略,低温溶液处理的介观PSC可以实现高达21.35%的效率,并具有轻微的滞后性和良好的重现性。尤其是,基于乳液的自下而上的自组装策略是从多种半导体纳米晶体制备微球的通用方法,因此它将大大扩展制备高效介观PSC甚至倒置介观器件的材料选择范围。
更新日期:2020-01-30
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