(318g) Nano- and Molecular Precursors for CdTe Photovoltaics | AIChE

(318g) Nano- and Molecular Precursors for CdTe Photovoltaics


Panthani, M. G. - Presenter, University of Chicago
Dolzhnikov, D., University of Chicago
Talapin, D. V., University of Chicago
Dietz, T., University of Chicago
Luther, J., National Renewable Energy Laboratory
Crisp, R., National Renewable Energy Laboratory

Solution-processable semiconductors offer the potential for inexpensive and high-throughput processing of photovoltaics with high materials utilization.  One approach that has been used to successfully produce high efficiency solar cells is to use solution-deposited materials as a nanocrystalline or molecular semiconducting thin film that can be annealed into a large-grained material.  We report approaches to producing crystalline CdTe films using nanocrystals capped with either pyridine or metal-chalcogenide complexes (MCCs) as well as MCCs alone.  We find that with low temperature  (~350°C) sintering in air, the grain size can be increased from ~5 nm to over 100 nm.  Out best solar cells show high short circuit currents (~24 mA cm-2) but low open circuit voltages (~600 - 700 mV).  Additionally, the devices require current and/or light soaking to achieve their maximum efficiency.  In optimized devices, power conversion efficiencies of up to 9.7% have been achieved in a ITO/CdTe/ZnO/Al configuration.  We find that the efficiency may be limited by non-ideal contacts and offer some insight into ways the open circuit voltage could be improved.