Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 60: Focus Session Hybrid Photovoltaics and Prevovskites I (joint session CPP HL, O)

CPP 60.5: Talk

Thursday, March 19, 2015, 10:45–11:00, C 130

A Comparative Study of Polythiophene/c-Si Hybrid Solar Cells and Inorganic a-Si:H/c-Si Devices — •M. Zellmeier¹, T. Brenner², S. Janietz³, N. H. Nickel¹, and J. Rappich¹ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institut für Silizium Photovoltaik, Kekulèstr. 5, 12489 Berlin — ²University of Potsdam, Institute of Physics & Astronomy, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm — ³Fraunhofer-Institut für Angewandte Polymerforschung (IAP), Abteilung Polymere und Elektronik, Geiselbergstr. 9, 14476 Potsdam

Non-excitonic polymer/silicon heterojunction solar cells regularly exceed power conversion efficiencies (PCE) of 10%. In combination with the possibility to use solution processing to form an electron-hole separating junction, this device type becomes highly attractive due to its potential for low cost processing. Here, we present a study in which P3HT/c-Si hybrid devices are compared to a-Si:H/c-Si heterojunctions. The advantages of the narrow absorption band of P3HT are pointed out using quantum efficiency measurements. Furthermore, the influence of the intrinsic interlayer (SiOx, Methylgroups) in the final device is investigated and directly compared to equivalent structures (SiOx, intrinsic a-Si:H) in the inorganic devices. The wafer lifetime with and without polymer was examined using quasi steady state photoconductance measurements (QSSPC) and interpreted regarding their influence on the open circuit voltage. The obtained results were used to improve the hybrid devices, leading to a high-performance hybrid solar cell with an open circuit voltage of 659 mV and a PCE of 11%.