Improved interfacial property by small molecule ethanediamine for high performance inverted planar perovskite solar cells

The introduction of ethanediamine into P3CT improves the crystallinity of adjacent perovskite film and passivates surface defects, with which a best PCE of 20.5% is achieved with negligible hysteresis. [Display omitted] We report a simple and effective method to realize desirable interfacial propert...

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Bibliographic Details
Published in:Journal of energy chemistry 2021-03, Vol.54, p.467-474
Main Authors: Zhang, Guodong, Zhang, Yunxin, Chen, Siqi, Chen, Hao, Liu, Le, Ding, Wenming, Wang, Jinhui, Zhang, Anyu, Pang, Shuping, Guo, Xin, Yu, Lianqing, Jiu, Tonggang
Format: Article
Language:English
Subjects:
Crystallinity
Ethanediamine
Improved interfacial property
Inverted planar perovskite solar cells
Passivated trap states
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Summary:The introduction of ethanediamine into P3CT improves the crystallinity of adjacent perovskite film and passivates surface defects, with which a best PCE of 20.5% is achieved with negligible hysteresis. [Display omitted] We report a simple and effective method to realize desirable interfacial property for inverted planar perovskite solar cells (PSCs) by using small molecule ethanediamine for the construction of a novel polyelectrolyte hole transport material (P3CT-ED HTM). It is found that P3CT-ED can not only improve the hole transport property of P3CT-K but also improve the crystallinity of adjacent perovskite film. In addition, the introduction of ethanediamine into P3CT realigns the conduction and valence bands upwards, passivates surface defects and reduces nonradiative recombination. As a consequence, compared to P3CT-K hole transport layer (HTL) based devices, the average power conversion efficiency (PCE) is boosted from 17.2% to 19.6% for the counterparts with P3CT-ED, with simultaneous enhancement in open circuit voltage and fill factor. The resultant device displays a champion PCE of 20.5% with negligible hysteresis.
ISSN:2095-4956
DOI:10.1016/j.jechem.2020.06.029