The Properties Measurement System Of Semiconductor Nanocrystal Photovaltaic Devices

Semiconductor nanocrystals, also known as quantum dots (QDs), have been an intensive research topic in the field of nanotechnology. Due to their exceptional optical absorption property, semiconductor nanocrystals would be able to improve photoelectricity property of optoelectronic devices.Graphene, as a two dimensional nanomaterial, has recently been discovered, showing excellent electrical conductivity and light transmittance. It might be used as transparent conductive films as a candidate replacing ITO application in optoelectronic devices.In the thesis, we presented the preparation of large scale continuous graphene films using chemical vapor deposition methods. The graphene films show sheet resistance of lower than ~1 kO per square, with -75 percent optical transparency. Further more, we prepared the composites of chemically converted graphene (CCG) and CdSe quantum dots. The flexible and transparent optoelectronic films made of the composites show the regular change of darkconductivity, photoconductivity and photosensitivity as increasing the loadings of CdSe QDs.