Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
The energy conversion in single junction solar cells is limited by the Schockley-Queisser limit linked to the bandgap of the semiconducting material, which defines the energy loss after absorption of higher energy photons, and limits the absorption of photons at the low energy end. Novel device concepts to overcome this limit have been proposed, based on photon conversion processes involving triplet excitons in organic materials. Triplet-triplet fusion, or upconversion via triplet-triplet annihilation (TTA-UC), has already been demonstrated [1,2] to increase the performance of solar cell devices. Understanding of the processes limiting the efficiency of the TTA-UC is important for further optimization of such devices.
this work, optical absorption and fluorescence spectroscopy as well as advance electron paramagnetic resonance (EPR) techniques are applied to investigate the fate of charge excitations in so-called “super-yellow” poly-paraphenylene vinylene (SY-PPV) copolymer doped with the triplet sensitizer palladium (meso-tetraphenyl-tetrabenzoporphyrin) (PdTPBP). this system TTA-UC has previously been studied [3], but was found to be quenched as soon as the sensitizer concentration in SY-PPV:PdTPBP films is increased above a few percent. As a function of sensitizer concentration in the films, triplet exciton (TE) and polaron (P) states are monitored by electrically- and optically detected magnetic resonance (EDMR and ODMR) and light-induced EPR, providing indications for TE-P annihilation as quenching mechanism. To shed light on the polaron-related processes, the well-known fullerene acceptor PCBM was introduced as electron trap in binary and ternary blends with the copolymer and the sensitizer. The nature and localization of the TE-P interactions will be discussed on the basis of these results.
[1] C. Li, C. Koeningsmann, F. Deng, A. Hagstrom, C. A. Schmuttenmaer, J.-H. Kim, ACS Photonics, 2016, 3, 784−790.
[2] Y. Y. Cheng, A. Nattestad, T. F. Schulze, R. W. MacQueen, B. Fückel, K. Lips, G. G. Wallace, T. Khoury, M. J. Crossley and T. W. Schmidt, Chem. Sci., 2016, 7, 559–568.
[3] V. Jankus, E. W. Snedden, D. W. Bright, V. Whittle, J. A. G. Williams , A. Monkman, Adv. Funct. Mater., 2013, 23, 384-39
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