Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We investigate the effect of the capping ligands of PbS quantum dots (QDs) on the characteristics of solar cells based on a bulk heterojunction (BHJ) of polymer of poly(3-hexylthiophene) (P3HT) and PbS QDs. We show that the nature of the capping ligand of the QDs has a major influence on the performance of P3HT:PbS solar cells. The measured power conversion efficiency of solar cells with a BHJ of P3HT:PbS QDs (90 wt%) with post deposition ligand exchange to 1,4 benzenedithiol is up to two orders of magnitude larger than that of previously reported hybrid cells based on a bulk heterojunction of P3HT:PbS QDs. Dark current density-voltage (J-V) measurements carried out on the device show a large leakage current and an efficient recombination which possibly explain the larger losses in and low fill factor of the hybrid system. Furthermore, photoluminescence (PL) quenching and photoinduced absorption (PIA) measurements carried out on samples prepared under experimental conditions similar to the solar cell devices provided insight into the working mechanism: Treatment with 1,4 benzenedithiol clearly leads to the most efficient charge transfer as shown by the clearly pronounced polaronic transitions and suppressed singlet-exciton (SE) peak intensity in the PIA spectra.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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