Additive-free, Cost-Effective Hole-Transporting Materials for Perovskite Solar Cells Based on Vinyl Triarylamines
- 22 July 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 12 (29), 32994-33003
- https://doi.org/10.1021/acsami.0c06055
Abstract
A series of cost-effective hole-transporting materials (TOP-HTMs) for perovskite solar cells (PSCs) was designed and synthesized. The molecules, composed of multiple 4,4'-dimethoxytriphenylamines linked to a benzene core via trans-vinylene units, can be manufactured from inexpensive materials through a simple synthetic route. The photophysical, electrochemical, and thermal properties, as well as hole mobilities, were strongly influenced by the position and number of vinyl triarylamine substituents on the core benzene ring. CH3NH3PbI3-based solar cells using the X-shaped TOP-HTM 3 with additives gave a high power conversion efficiency of 17.5% (forward scan)/18.6% (reverse scan). Crucially, TOP-HTMs gave high working device efficiency without the need for conduction-enhancing additives. The power conversion efficiency for the device with additive-free TOP-HTM 3 was 16.0% (forward scan)/16.6% (reverse scan). Device stability is also enhanced and is superior to the reference HTM, 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (Spiro-OMeTAD).Funding Information
- New Energy and Industrial Technology Development Organization
- Center of Innovation Program (JPMJCE 1307)
- Japan Society for the Promotion of Science (19K05666, 19K23631)
- Advanced Low Carbon Technology Research and Development Program (JPMJAL 1603)
- Institute for Chemical Research, Kyoto University
- Integrated Research Consortium on Chemical Sciences
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