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In this work, we report on a simple non-injection synthesis routine for the preparation of well-dispersed monocrystalline Cu 2 ZnSnS 4  (CZTS) nanoparticles (NPs). The nanocrystal morphology was investigated by scanning and transmission electron microscopy, and its phase composition was studied by X-ray diffraction and Raman analyses. Cu 2 ZnSnS 4  nanoparticles prepared using ethanolamine and diethanolamine as chemical stabilizers showed a high purity and a suitable size for polymer solar cell applications. The fabricated CZTS NPs are shown to be easily dispersed in a polymer/fullerene aromatic solution as well as the hybrid photovoltaic active layer. Thanks to the increment in the light absorption and electrical conductivity of the active layer, solar cells with a small amount of CZTS nanoparticles resulted in a clear enhancement of the photovoltaic performance. The short-circuit current density is increased from 9.90 up to 10.67 mA/cm 2 , corresponding to an improvement in the power conversion efficiency (PCE) from 3.30 to 3.65%.

Well-Dispersed Cu2ZnSnS4 Nanocrystals Synthesized from Alcohols and Their Applications for Polymer Photovoltaics