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 12 2021
Accepted
16 3 2022
First published
16 3 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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