Abstract
Densely packed and highly ordered CdSe quantum dots (QDs) arrays were prepared through a slow evaporation route; to study the photo-generated charges property of ordered CdSe QDs arrays, illumination induced charge separation in the CdSe QDs arrays were investigated through surface photovoltage (SPV) technology based on lock in amplifier. The significantly enhanced SPV signal of CdSe QDs arrays after post-annealing treatment could be attributed to the greatly increased escape of holes from CdSe QDs surface, as well as the decreased the inter nanocrystal distance. Moreover, much faster excess holes dominates in the frequency range of 30 Hz and 200 Hz, which results in the positive charging of the CdSe QDs arrays near the surface. Our results give a guide for its practical photoelectric applications based on nanocrystals.
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