Interface engineering with a novel n-type small organic molecule for efficient inverted perovskite solar cells

Wang H, Yang F, Li N, Song J, Qu J, Hayase S, Wong WY (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Chemical Engineering Journal Elsevier

Article Number: 123677

DOI: 10.1016/j.cej.2019.123677

Abstract

Fullerene derivatives are promising electron transporting materials for low-temperature processed inverted perovskite solar cells (PSCs). However, fullerene derivatives have some disadvantages, e.g. [6,6]-phenyl C61 butyric acid methyl ester (PCBM) has unmanageable morphology, low electron mobility and easily generated non-radiative recombination, which restrict the performance of PSCs. Herein, a novel n-type small organic molecule, homologous perylene diimide tetramer (HPDT), is designed and synthesized in this work to engineer the interface properties by enhancing interface contact, decreasing energetic barrier and recombination losses. HPDT shows suitable energy levels and high electron mobility and thus will increase the electron mobility during interface engineering in the inverted PSCs. Moreover, coating HPDT on top of perovskite prior to the deposition of PCBM is helpful to achieve a homogeneous pinhole-free PCBM layer, leading to enhanced power conversion efficiency from 17.38% up to 19.75% for inverted MAPbI3 PSCs along with a negligible hysteresis. Significantly, our results undoubtedly provide new guidelines in exploring n-type organic small molecules for high-performance PSCs.

Authors with CRIS profile

Ning Li Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Shenzhen University (SZU) / 深圳大学 CN China (CN) Kyushu Institute of Technology JP Japan (JP) Hong Kong Polytechnic University (PolyU) CN China (CN)

How to cite

APA:

Wang, H., Yang, F., Li, N., Song, J., Qu, J., Hayase, S., & Wong, W.Y. (2019). Interface engineering with a novel n-type small organic molecule for efficient inverted perovskite solar cells. Chemical Engineering Journal. https://doi.org/10.1016/j.cej.2019.123677

MLA:

Wang, Helin, et al. "Interface engineering with a novel n-type small organic molecule for efficient inverted perovskite solar cells." Chemical Engineering Journal (2019).

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