High-performance perovskite/Cu(In,Ga)Se2 monolithic tandem solar cells

The combination of hybrid perovskite and Cu(In,Ga)Se2 (CIGS) has the potential for realizing high-efficiency thin-film tandem solar cells because of the complementary tunable bandgaps and excellent photovoltaic properties of these materials. In tandem solar device architectures, the interconnecting layer plays a critical role in determining the overall cell performance, requiring both an effective electrical connection and high optical transparency. We used nanoscale interface engineering of the CIGS surface and a heavily doped poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) hole transport layer between the subcells that preserves open-circuit voltage and enhances both the fill factor and short-circuit current. A monolithic perovskite/CIGS tandem solar cell achieved a 22.43% efficiency, and unencapsulated devices under ambient conditions maintained 88% of their initial efficiency after 500 hours of aging under continuous 1-sun illumination.

Source: ScienceNOW - August 30, 2018 Category: Science Authors: Han, Q., Hsieh, Y.-T., Meng, L., Wu, J.-L., Sun, P., Yao, E.-P., Chang, S.-Y., Bae, S.-H., Kato, T., Bermudez, V., Yang, Y. Tags: Engineering, Materials Science reports Source Type: news