Additive-free, Cost-Effective Hole-Transporting Materials for Perovskite Solar Cells Based on Vinyl Triarylamines
journal contributionposted on 09.07.2020, 12:36 by Hidetaka Nishimura, Iku Okada, Taro Tanabe, Tomoya Nakamura, Richard Murdey, Atsushi Wakamiya
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).
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X-shaped TOP-HTM 3Device stabilityVinyl Triarylaminesadditive-free TOP-HTM 3vinyl triarylamine substituentsconduction-enhancing additivespower conversion efficiencydevice efficiencyCost-Effective Hole-Transporting Ma...core benzene ringPSCbenzene corereference HTMPerovskite Solar Cellshole mobilitieshole-transporting materialsscanvinylene unitsCH 3 NH 3 PbI 3