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Orbital-Energy Modulation of Tetrabenzoporphyrin-Derived Non-Fullerene Acceptors for Improved Open-Circuit Voltage in Organic Solar Cells
摘要： Tetrabenzoporphyrin (BP) holds attractive characteristics for optoelectronic applications, such as the large π-conjugated framework and high photoabsorption capability. However, its use in organic solar cells (OSCs) has been limited because of the extremely low solubility that hampers direct solution processing and also the high frontier-orbital energies that lead to low open-circuit voltage (VOC). Herein, we examine BP derivatives equipped with multiple strongly electron-withdrawing groups for photovoltaic applications. The derivatives are generated in thin films through a thermal precursor approach, wherein the corresponding bicyclo[2.2.2]octadiene-fused porphyrin derivatives are solution-cast, and then annealed to carry out the in situ retro-Diels–Alder reaction. The frontier-orbital energies of the resulting derivatives are effectively stabilized as compared to pristine BP to such a degree that they afford high VOC of up to 0.94 V when used as a donor, or can even work as a new class of non-fullerene acceptor in OSCs. Single-crystal X-ray diffraction analyses demonstrate that the conformation of the BP framework largely varies from being near planar to highly curved depending on its substituents. The morphology of polymer:BP-derivative bulk-heterojunction films prepared by the thermal precursor approach also varies between the BP derivatives. These results can greatly extend the scope of both molecular design and morphology control for utilization of the BP chromophore toward achieving viable organic optoelectronic devices.
关键词： Tetrabenzoporphyrin,organic solar cells,thermal precursor approach,frontier-orbital energies,non-fullerene acceptors
更新于2025-09-16 10:30:52
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Highly efficient perovskite solar cell utilizing a solution-processable tetrabenzoporphyrin hole transport material with p-type dopants
摘要： We demonstrate an efficient hole transporting material (HTM), soluble non-peripherally substituted octahexyl tetrabenzoporphyrin (C6TBPH2), for perovskite solar cells and determine the role of p-type dopants in improving the photovoltaic performance of devices utilizing this C6TBPH2 HTM. By adding p-type dopants, the fill factor and short-circuit current density under a reverse bias scan are improved from 0.20 ± 0.02 to 0.66 ± 0.03 and from 15 ± 2 to 20.8 ± 0.1 mA cm?2, respectively, due to formation of oxidized C6TBPH2 radical cations. Hence, the devices utilizing C6TBPH2 HTM achieve power conversion efficiencies of 15.2%, which are comparable with devices utilizing commercial HTMs fabricated under similar conditions.
关键词： perovskite solar cell,hole transport material,tetrabenzoporphyrin,photovoltaic performance,p-type dopants
更新于2025-09-11 14:15:04