Dual‐Use Self‐Assembled Monolayer Controlling Charge Carrier Extraction in Organic Solar Cells

Author:

Xu Zhuo12ORCID,Meitzner Rico123,Anand Aman12ORCID,Djoumessi Aurelien Sokeng12,Stumpf Steffi14,Neumann Christof2456ORCID,Turchanin Andrey2456ORCID,Müller Frank A.247,Schubert Ulrich S.124ORCID,Hoppe Harald12ORCID

Affiliation:

1. Laboratory of Organic and Macromolecular Chemistry (IOMC) Friedrich Schiller University Jena Humboldtstrasse 10 07743 Jena Germany

2. Center for Energy and Environmental Chemistry Jena (CEEC Jena) Friedrich Schiller University Jena Philosophenweg 7a 07743 Jena Germany

3. Helmholtz‐Zentrum Berlin GmbH Hahn‐Meitner Platz 1 14109 Berlin Germany

4. Jena Center for Soft Matter (JCSM) Friedrich Schiller University Jena Philosophenweg 7 07743 Jena Germany

5. Institute of Physical Chemistry Friedrich Schiller University Jena Lessingstrasse 10 07743 Jena Germany

6. Abbe Center of Photonics Albert‐Einstein‐Strasse 6 07745 Jena Germany

7. Otto‐Schott‐Institute of Materials Research (OSIM) Friedrich‐Schiller‐University of Jena Löbdergraben 32 07743 Jena Germany

Abstract

AbstractThe development and use of interface materials are essential to the continued advancement of organic solar cells (OSCs) performance. Self‐assembled monolayer (SAM) materials have drawn attention because of their simple structure and affordable price. Due to their unique properties, they may be used in inverted devices as a modification layer for modifying ZnO or as a hole transport layer (HTL) in place of typical poly(3,4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS) in conventional devices. In this work, zinc oxide (ZnO) is modified using five structurally similar SAM materials. This resulted in a smoother surface, a decrease in work function, a suppression of charge recombination, and an increase in device efficiency and photostability. In addition, they can introduced asfor hole extraction layer between the active layer and MoO3, enabling the use of the same material at several functional layers in the same device. Through systematic orthogonal evaluation, it is shown that some SAM/active layer/SAM combinations still offered device efficiencies comparable to ZnO/SAM, but with improved device’ photostability. This study may provide recommendations for future SAM material's design and development as well as a strategy for boosting device performance by using the same material across both sides of the photoactive layer in OSCs.

Funder

China Scholarship Council

European Regional Development Fund

Freistaat Thüringen

Thüringer Ministerium für Wirtschaft, Wissenschaft und Digitale Gesellschaft

Deutsche Forschungsgemeinschaft

Publisher

Wiley

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