Dresden 2011 – wissenschaftliches Programm
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AKE: Arbeitskreis Energie
AKE 11: Photovoltaik
AKE 11.2: Vortrag
Mittwoch, 16. März 2011, 17:00–17:15, BEY 118
Efficiency enhancement of bulk-heterojunction solar cells. — Michael Krüger1,2, Yunfei Zhou1,2, and •Michael Eck1,2 — 1Universität Freiburg, Materialforschungszentrum (FMF), Freiburg, Deutschland — 2Universität Freiburg, Institut für Mikrosystemtechnik, (IMTEK), Freiburg, Deutschland
Inorganic semiconductor nanocrystals (NCs) such as CdSe NCs, with tunable bandgaps and high intrinsic charge carrier mobilities can act as good electron acceptors and be incorporated into conjugated polymers to form bulk-heterojunction hybrid solar cells. Nevertheless their power conversion efficiencies (PCEs) are still lagging behind the PCEs of fullerene based devices but they show high potential for improvement. Here we report on the efficiency enhancement of CdSe NC based devices due to different postsynthetic treatments of the NCs, the use of low-bandgap polymers and optimized device structures including active layer thickness, electrode materials, novel NC hybrid structures and approaches to control the nanomorphology. PCEs approaching 3% and above are available and further enhancement can be expected by exploring and combining the above mentioned approaches.