Rodriguez-Seco, CristinaMendez, MariaRoldan-Carmona, CristinaCabau, LydiaAsiri, Abdullah M.Nazeeruddin, Mohammad KhajaPalomares, Emilio2020-08-202020-08-202020-08-202020-07-2210.1021/acsami.0c07586https://infoscience.epfl.ch/handle/20.500.14299/170976WOS:000555417200047Four 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.Nanoscience & NanotechnologyMaterials Science, MultidisciplinaryScience & Technology - Other TopicsMaterials Sciencepush-and-pullbenzothiadiazolehole transporting materialsperovskite solar cellsrecombination kineticsopen-circuit voltagetransporting materialslow-costrecombinationsubstituentsderivativessensitizersmoleculeslifetimestext::journal::journal article::research article