Solar energy has captured attention of scientists for addressing current energy crisis and critical environmental issues. With light absorption and large extinction coefficients over a broad spectral region, colloidal quantum dots (QDs), which are semiconductor nanocrystals covered with surfactant molecules and dispersed in solution, have been regarded as promising nanomaterials for converting solar energy into an easily usable form.
Despite easy synthesis and preparation, controlling size and shape of QDs is feasible in achieving tunable optical and electrical properties. Therefore, QDs have also been of interest in future optoelectronic devices including field-effect transistors, LEDs, sensors and solar cells.
The main objectives of my research focus on investigating environment-friendly QDs and tuning their optoelectronic properties to achieve high performance solar cells and photoelectrochemical water splitting. The research details are listed below: (I) Synthesis of environment-friendly CuInS2 and CuInSe2-xSx QDs with desirable sizes and optoelectronic properties. (II) Preparation of CuInS2 and CuInSe2-xSx QDs films to fabricate high performance solar cell. (III) N or P-type semiconductor decorated with CuInS2 and CuInSe2-xSx QDs as photoanode or photocathode for efficient photoelectrochemical water splitting.