Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 48: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics VI
CPP 48.5: Talk
Thursday, March 12, 2026, 12:30–12:45, ZEU/LICH
Controlling singlet fission in diketopyrrolopyrole diner through solvent choices — •Sruthy Asa Rajan1,2, Isaac M. Etchells3, Jegadesan Subbiah2, Sergey Bagnich1, Paul E. Shaw3, David Jones2, and Anna Köhler1 — 1Universität Bayreuth — 2University of Melbourne — 3University of queensland
The efficiency of conventional solar cells is constrained by the Shockley-Queisser limit, which is arises from thermalisation loss. Singlet fission (SF) offers a promising pathway to surpass this efficiency limit. However, a key challenge lies in identifying SF molecules with triplet energy levels that align with the silicon band gap, enabling the efficient formation of correlated triplet pairs, 1(TT), and their separation. PDPP is a molecule with a comparable triplet energy to the silicon bandgap. But monomer molecules are not SF active in solution. We prepared PDPP-dimers with a pyrene bridge. We investigate the influence of solvent properties on the optical behaviour of these N-alkylated pyrene-bridged PDPPs. We employ temperature-dependent steady-state and time-resolved photoluminescence studies on N-alkylated pyrene-bridged PDPPs in protic polar and aprotic polar solvents to study the optical properties of the evolution of different species. At an intermediate temperature, we observed an intermediate emission, which then, on further decreasing the temperature (less than 100K), is replaced by 1(TT) emission. We also measured TA on different solvents which showed different pathway. In protic polar solvent, our molecule showed intermolecular SF whereas in aprotic polar solvent it showed intermolecular
Keywords: Singlet fission; Organic solar cell; Diketopyrrolopyrole dimer; Shockley-Queisser limit; Photovoltaics