Sintered CdTe nanocrystal films for optoelectronic applications and the sublimation of CdSe nanorods
Advances in colloidal nanocrystal chemistries have enabled more complex fabrication of nanostructured materials. Colloidal nanocrystals can be easily deposited from solution and used in a variety of optoelectronic applications such as photodetectors and photovoltaics. Colloidal nanocrystals deposited as films act as the light absorbing layer. These films can be used as-is or be sintered into polycrystalline films. Introducing dopant species as a surface species on semiconducting nanocrystals allows controlled doping profiles in sintered films where the dopant preferentially segregates at the grain boundaries. Chloride in CdTe films is one well-known example of this phenomena. The focus of this work is designing chloride-capped CdTe nanocrystal building blocks and sintering these into polycrystalline films with controlled grain structure and therefore doping profiles. Applications investigated for these films are solar cells and photodetectors.