Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 143, Issue -, Pages 369-374Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2015.07.003
Keywords
Hole-selective contact; Copper-iodide; Organic photovoltaics; Inorganic-organic junction
Funding
- ICTP (International Centre for Theoretical Physics) in the framework of ANSOLE (African Network for Solar Energy)'s ANEX fellowship program
- Austrian Fund for Advancement of Science (FWF) within the Wittgenstein Prize scheme [Z222-N19]
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An important issue in construction of organic photovoltaic cells concerns the selective contacts. Here, especially the modification of the hole-extraction is challenging, as energy levels have to match the polymer's highest occupied molecular orbital (HOMO). We took the view to the mutual anode interface and we sought for a solution-based alternative for commonly used PEDOT:PSS - with an eye on improving the hole-extraction with an inorganic interlayer. We present copper iodide (CuI) as a versatile inorganic p-type semiconductor that meets the requirements for enhanced charge extraction in donor polymers. We applied two types of anthracene-containing PPE-PPV block-copolymers that recently gained attention as efficient active absorbers in bulk heterojunction photovoltaic cells. We report on the advantages using CuI as hole-selective contact and show an improvement of the power conversion efficiency in polymer-based solar cells. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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