Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.128
Publication date: 20th April 2022
Singlet fission (SF) in organic semiconductors is a promising concept that can be used to increase the efficiency of photovoltaic cells. Upon light absorption a singlet exciton (S = 0) is created, which via an intermediate triplet-pair (TT) state (S = 1 ⊗ S = 1) splits into two triplet excitons (S = 1). This carrier-multiplication process potentially reduces the thermalization losses hampering solar power conversion efficiency. Recently, low-temperature photoluminescence (PL) spectroscopy in magnetic fields up to 68 T has been used to study triplet-pair emission in TIPS tetracene (5,12-bis(triisopropylsilylethynyl)tetracene) [1]. Multiple triplet pairs were identified, the emission of which is quenched at resonant magnetic fields when the singlet TT-sublevel coincides with the triplet and quintet sublevels. Here, we report the direct observation of triplet-pair emission at 1.4 K and 0 T in high-quality TIPS-tetracene single crystals. From PL studies in magnetic fields up to 30 T we determine the exchange coupling constant of the emissive pair to be J = 0.44 meV. The triplet-pair emission displays a characteristic vibrational spectrum and is found to disappear above 2.4 K, which is attributed to the thermal activation of triplet-pair dissociation via the quintet states [2]. Most remarkably, we find that the 1.4 K triplet-pair PL decay time exceeds 10 microseconds, indicating that in the absence of thermal dissociation the triplet pairs can have a very long lifetime [2]. Our results pave the way for a detailed (time-resolved) study of the properties of triplet pairs and the SF process.
V.S. Bechai, K. van den Hoven, H. Engelkamp, P.C.M. Christianen. High Field Magnet Laboratory (HFML - EMFL), Radboud University, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands. This work was supported by HFML-RU/NWO-I, member of the European Magnetic Field Laboratory (EMFL).
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