Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations

We report a -conjugation–induced extension of electronic states of A-site cations that affects perovskite frontier orbitals. The -conjugated pyrene-containing A-site cations electronically contribute to the surface band edges and influence the carrier dynamics, with a properly tailored intercalation distance between layers of the inorganic framework. The ethylammonium pyrene increased hole mobilities, improved power conversion efficiencies relative to that of a reference perovskite, and enhanced device stability.

Source: ScienceNOW - February 4, 2021 Category: Science Authors: Xue, J., Wang, R., Chen, X., Yao, C., Jin, X., Wang, K.-L., Huang, W., Huang, T., Zhao, Y., Zhai, Y., Meng, D., Tan, S., Liu, R., Wang, Z.-K., Zhu, C., Zhu, K., Beard, M. C., Yan, Y., Yang, Y. Tags: Materials Science reports Source Type: news