Issue 27, 2023, Issue in Progress

UV ozone treatment for oxidization of spiro-OMeTAD hole transport layer

Abstract

For practical application of perovskite photovoltaic devices, it is vital to choose an appropriate carrier extraction material with high mobility, high conductivity, and appropriate molecular energy levels. One of the most frequently used hole transport materials, spiro-OMeTAD, is known to show an improvement in its electrical properties after the oxidation reaction. However, this oxidation reaction is generally accomplished by simple atmospheric exposure, often taking one or more nights under atmospheric conditions, and thus the development of a rapid oxidation strategy without the degradation of device performance is strongly required. Here, we propose a rapid and reproducible oxidation route employing a UV ozone treatment process that enables quick oxidation of spiro-OMeTAD in solution, as short as 30 seconds. Optical and electrical characterization reveals that this method modifies the highest occupied molecular orbital energy level of spiro-OMeTAD to reduce the voltage loss, and also improves the conductivity and mobility, leading to the enhancement in the photovoltaic properties. This finding will provide useful insights into the further development of spiro-OMeTAD-based perovskite solar cell devices.

Graphical abstract: UV ozone treatment for oxidization of spiro-OMeTAD hole transport layer

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2023
Accepted
01 Jun 2023
First published
20 Jun 2023
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2023,13, 18561-18567

UV ozone treatment for oxidization of spiro-OMeTAD hole transport layer

R. Hayashi, A. Murota, K. Oka, Y. Inada and K. Yamashita, RSC Adv., 2023, 13, 18561 DOI: 10.1039/D3RA02315J

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