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Light‐Promoted Electrostatic Adsorption of High‐Density Lewis Base Monolayers as Passivating Electron‐Selective Contacts
Advanced Science ( IF 15.1 ) Pub Date : 2021-01-04 , DOI: 10.1002/advs.202003245
Xi Yang 1 , Zhiqin Ying 1, 2 , Zhenhai Yang 1 , Jia‐Ru Xu 3 , Wei Wang 1 , Jiajia Wang 1 , Zenggui Wang 1 , Lingze Yao 1 , Baojie Yan 1 , Jichun Ye 1
Affiliation  

Achieving efficient passivating carrier‐selective contacts (PCSCs) plays a critical role in high‐performance photovoltaic devices. However, it is still challenging to achieve both an efficient carrier selectivity and high‐level passivation in a sole interlayer due to the thickness dependence of contact resistivity and passivation quality. Herein, a light‐promoted adsorption method is demonstrated to establish high‐density Lewis base polyethylenimine (PEI) monolayers as promising PCSCs. The promoted adsorption is attributed to the enhanced electrostatic interaction between PEI and semiconductor induced by the photo‐generated carriers. The derived angstrom‐scale PEI monolayer is demonstrated to simultaneously provide a low‐resistance electrical contact for electrons, a high‐level field‐effect passivation to semiconductor surface and an enhanced interfacial dipole formation at contact interface. By implementing this light‐promoted adsorbed PEI as a single‐layered PCSC for n‐type silicon solar cell, an efficiency of 19.5% with an open‐circuit voltage of 0.641 V and a high fill factor of 80.7% is achieved, which is one of the best results for devices with solution‐processed electron‐selective contacts. This work not only demonstrates a generic method to develop efficient PCSCs for solar cells but also provides a convenient strategy for the deposition of highly uniform, dense, and ultra‐thin coatings for diverse applications.

中文翻译:

高密度路易斯碱单层作为钝化电子选择性接触的光促进静电吸附。

实现高效的钝化载流子选择触点(PCSC)在高性能光伏设备中起着至关重要的作用。但是,由于接触电阻率和钝化质量的厚度依赖性,在单一夹层中同时实现有效的载流子选择性和高水平的钝化仍然具有挑战性。在本文中,光促进吸附的方法被证明可以建立高密度的路易斯碱聚乙烯亚胺(PEI)单层,作为有前途的PCSC。促进的吸附归因于光生载流子引起的PEI和半导体之间增强的静电相互作用。已证明派生的埃级PEI单层可同时为电子提供低电阻电接触,半导体表面的高水平场效应钝化和接触界面处界面偶极子形成的增强。通过将这种光促进的吸附式PEI实施为单层PCSC,用于n型硅太阳能电池可实现19.5%的效率,0.641 V的开路电压和80.7%的高填充系数,这对于采用溶液处理的电子选择性触点的器件而言,是最佳结果之一。这项工作不仅展示了开发用于太阳能电池的高效PCSC的通用方法,而且还为沉积用于各种应用的高度均匀,致密和超薄的涂层提供了便捷的策略。
更新日期:2021-03-03
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