Hybrid polymer-CdSe solar cells with a ZnO nanoparticle buffer layer for improved efficiency and lifetime

作者：Qian Lei; Yang Jihua; Zhou Renjia; Tang Aiwei; Zheng Ying; Tseng Teng Kuan; Bera Debasis; Xue Jiangeng^*; Holloway Paul H

来源：Journal of Materials Chemistry, 2011, 21(11): 3814-3817.

DOI：10.1039/c0jm03799k

We report the use of a solution-processed ZnO nanoparticle buffer layer in hybrid solar cells based on blends of poly(3-hexylthiophene) (P3HT) and CdSe quantum dots. Depending on the size of the CdSe nanocrystal, these devices exhibit 20-70% higher photocurrent output than similar devices without the ZnO nanoparticle layer, which is attributed to a combination of electronic and optical effects. With negligible change in open-circuit voltage and a small increase in the fill factor, the power conversion efficiency of these P3HT : CdSe hybrid solar cells was increased by 30-80% with incorporation of the ZnO nanoparticle layer. The presence of the ZnO nanoparticle layer also drastically improves the stability of these hybrid solar cells. Less than 40% loss in efficiency was observed for such devices after 70 days of exposure to the laboratory ambient without any type of encapsulation.

• 出版日期2011