Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Organic Electronics and Photovoltaics IV: OPV (joint session CPP/DS/HL, organized by CPP)

CPP 41.6: Talk

Wednesday, March 22, 2017, 16:30–16:45, ZEU 260

Experimental and simulated illumination dependent conductivity changes in organic bulk hetero junction solar cells — •Arne Müller, Vladislav Jovanov, and Veit Wagner — Jacobs University Bremen,Campus Ring 1, 28579 Bremen, Deutschland

The usage of organic solar cells for indoor application or for wearable electronics requires a good functionality for a wide range of irradiated light intensities. Therefore the IV behaviour of bulk hetero junction solar cells is analysed for a large variety of illumination intensities. We find that the IV-characteristic differs from the predictions of the Shockley-model, which is attributed to the low mobility of the charge carriers. The results are compared to drift-diffusion device simulations and with a simplified device model based on the Fermi-level spitting behaviour inside the semiconductor. In addition JscVoc experiments were performed to gain an insight into the series-resistance properties at different light intensities. As expected we found that the conductivity of the device is changed due to the light created charge carriers. The findings of the JscVoc analysis are then compared to our improved device model.