Benzothiadiazole Aryl-amine Based Materials as Efficient Hole Carriers in Perovskite Solar Cells

Abstract
Four hole transport materials (HTMs) based on a benzothiadiazole (BT) central core have been synthesized and successfully employed in triple-cation mixed-halide perovskite solar cells (PSCs), reaching 18.05% solar to energy conversion efficiency. The synthesis of these HTMs follows the push-and-pull approach to modulate the HOMO energy level by combining the BT group as an electron acceptor and diphenyl- and triphenyl-amines as electron donors. Here we show that despite adjusting the HOMO energy level to that of the perovskite is a believed requisite to achieve efficient interfacial hole transfer, additional factors must be taken into account to design novel and efficient HTMs, such as a high hole mobility, solubility in organic solvents, and thermal stability.
Funding Information
  • Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung
  • Ministerio de Econom?a y Competitividad (CTQ2013-47183, CTQ2017?89814-P)
  • Ag?ncia de Gesti? d'Ajuts Universitaris i de Recerca (2017SGR00978)

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