Issue 5, 2022

Simple approach for an electron extraction layer in an all-vacuum processed n-i-p perovskite solar cell

Abstract

Vacuum processing is considered to be a promising method allowing the scalable fabrication of perovskite solar cells (PSCs). In vacuum processed PSCs, the n-i-p structure employing organic charge transport layers is less common than the p-i-n structure due to limited options to achieve an efficient electron extraction layer (EEL) on indium tin oxide (ITO) with vacuum thermal evaporation. There are a number of specific applications where an n-i-p structure is required and therefore, it is of interest to have alternative solutions for the n-type contact in vacuum processed PSCs. In this work, we report an efficient vacuum deposited EEL using a mixture of conventional organic small molecules, C60 and bathocuproine (BCP). Incorporation of BCP into C60 does not result in conventional n-doping; however, we observed enhanced charge extraction, which significantly increased the power conversion efficiency (PCE) from 13.1% to 18.1% in all-vacuum processed PSCs. The C60:BCP mixed (co-sublimated) film most likely results in shifted energy levels leading to better alignment with the electrodes.

Graphical abstract: Simple approach for an electron extraction layer in an all-vacuum processed n-i-p perovskite solar cell

Supplementary files

Article information

Article type
Communication
Submitted
23 Dec. 2021
Accepted
16 Marts 2022
First published
16 Marts 2022
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2022,1, 252-257

Simple approach for an electron extraction layer in an all-vacuum processed n-i-p perovskite solar cell

B. Kim, D. Pérez-del-Rey, A. Paliwal, C. Dreessen, M. Sessolo and H. J. Bolink, Energy Adv., 2022, 1, 252 DOI: 10.1039/D1YA00084E

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