Integrated solar cells with non‐toxic inorganic nanocrystals and polymer bulk heterojunction

This work presents a novel integrated solar cell with non-toxic copper indium disulfide (CuInS 2 ) nanocrystals (NCs) and stacked polymer bulk heterojunction. This parallel tandem structure avoids the use of the additional interlayer. Through the morphology, structure characterization, and optical property of the prepared CuInS 2 NCs film and CuInS 2 /P3HT:PCBM integrated structure, it is demonstrated that the CuInS 2 NCs layers in the integrated solar cells are multifunctional, which not only act as a strong light absorber but also an efficient hole transporter. Compared to the neat polymer bulk heterojunction solar cells, the photovoltaic performance of the integrated solar cells has been improved.