Relation of Nanostructure and Recombination Dynamics in a Low‐Temperature Solution‐Processed CuInS2 Nanocrystalline Solar Cell
作者： Hamed Azimi , Thomas Heumüller , Andreas Gerl , Gebhard Matt , Peter Kubis
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摘要: The understanding and control of nanostructures with regard to transport recombination mechanisms is key importance in the optimization power conversion efficiency (PCE) solar cells based on inorganic nanocrystals. Here, properties solution-processed are investigated using photo-CELIV (photogenerated charge carrier extraction by linearly increasing voltage) transient photovoltage techniques; prepared an in-situ formation CuInS2 nanocrystals (CIS NCs) at low temperature 270 °C. Structural morphological analyses reveal presence a metastable CuIn5S8 phase disordered morphology nanocrytalline films consisting polycrystalline grains nanoscale range. Consistent CIS NC thin films, devices characterized mobility. density dynamic indicates that kinetics these follows dispersive bimolecular model does not fully behave diffusion-controlled manner, as expected Langevin-type recombination. mobility–lifetime product carriers properly explains performance (200 nm) cell high fill-factor 64% PCE over 3.5%.
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