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Colloidal quantum dots(CQDs), especially lead chalcogenide CQDs, are regarded as promising materials for the next generation solar cells, due to their large absorption coefficient, excellent charge transport,and multiple exciton generation effect. We successfully synthesized highly-crystalline, monodispersed,well-alloyed PbS_xTe_(1-x) nanocrystals via a one-pot, hot injection reaction method. Energy-filtered transmission electron microscopy suggested that the S and Te anions were uniformly distributed in the alloy nanoparticles. The photovoltaic performance of CQD solar cells based on ternary PbS_xTe_(1-x) was reported for the first time. The photovoltaic devices using PbS_xTe_(1-x) were more efficient than either the pure PbS or the PbTe based devices. In addition, the PbS_xTe_(1-x) based devices showed a significantly improved stability than that of the PbTe based devices.
Colloidal quantum dots (CQDs), especially lead chalcogenide CQDs, are presented as promising materials for the next generation solar cells, due to their large absorption coefficient, excellent charge transport, and multiple exciton generation effects. We successfully synthesized highly-crystalline, monodispersed, Energy-filtered transmission electron microscopy suggested that the S and Te anions were uniformly distributed in the alloy nanoparticles. The photovoltaic performance of CQD solar cells based The photovoltaic devices using PbS_xTe_ (1-x) were more efficient than either pure PbS or the PbTe based devices. In addition, the PbS_xTe_ (1-x) was reported for the first time devices showed a significantly improved stability than that of the PbTe based devices.