Abstract: Colloidal quantum dots prepared by Ⅳ-Ⅵ compounds were considered to be very promising narrow band gap photovoltaic materials thanks to their simple synthesis methods and adjustable band gap. In recent years, the highest conversion efficiency of colloidal quantum dot solar cells prepared by Ⅳ-Ⅵ compounds has exceeded 10%. This paper introduces synthesis methods, basic structure and the optical and electrical properties of Ⅳ-Ⅵ compounds, analyzes the current research status of Schottky and heterojunction colloidal quantum dot solar cells, points out the existing problems and the development trend, and proposes key problem to be solved in the future.
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