Bulk-heterojunction photovoltaic devices based on donor–acceptor organic small molecule blends |
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Authors: | D Gebeyehu B Maennig J Drechsel K Leo M Pfeiffer |
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Affiliation: | Institut für Angewandte Photophysik, Technische Universität Dresden George-Baehr Str. 1, D-01062, Dresden, Germany |
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Abstract: | We present a systematic study on photovoltaic devices that combine an organic small molecule photoactive donor–acceptor bulk heterojunction system with controlled doping of the charge transport layers. The doped transport layers are formed using high vacuum co-evaporation deposition technique (i.e. co-sublimation of matrix and dopant). Solar cell devices have been fabricated based on zinc-phthalocyanine (ZnPc) as donor (D) and fullerene (C60) as electron acceptor (A) with doped charge transport layers. The cells show a short circuit current, Isc=1.5 mA/cm2, an open circuit voltage, Voc=450 mV, a fill factor, FF=0.5, and a power conversion efficiency, ηe=3.37% under
sun (10 mW/cm2) white light illumination. In addition, these bulk-heterojunction photovoltaic devices were characterized under 1 sun (100 mW/cm2) white light illumination showing Isc=6.3 mA/cm2, Voc=500 mV, and ηe=1.04%. We have observed that the performance of such ‘bulk-heterojunction’ photovoltaic devices is critically dependent on the transport properties of the interpenetrating network D/A system and doped charge transport layers. |
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Keywords: | Organic solar cells Bulk heterojunction Donor/acceptor blend Vacuum coevaporation deposition Doped transport layers Metal/semiconductor interfaces |
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