A research team from Xi'an Jiaotong University (XJTU) led by Professor Wu Zhaoxin has developed a method of modifying a perovskitoid light-absorbing layer on the surface of a low-dimensional perovskitoid-like passivation layer.

Their method effectively reduces the density of defect states at the grain boundary and surface of the perovskitoid thin film.

This research demonstrates that abundant low-dimensional perovskitoids that can achieve lattice-matched growth on themselves provide a wider range of options for the design of efficient and stable perovskitoid devices. This new finding may throw some light on design of efficient and highly stable perovskitoid devices in the future.

This work was published in the journal Science Advances under the title Highly efficient and stable perovskitoid solar cells enabled by low-dimensional perovskitoids. (Link to the paper: https://www.science.org/doi/full/10.1126/sciadv.abk2722)

The first author is Chen Jinbo, a doctoral student in the research group. Associate Professor Dong Hua, Distinguished Researcher Li Jingrui, and Professor Wu at the School of Electrical Engineering and Professor Ren Guangyu at City University of Hong Kong are the co-corresponding authors. This work was financed by the National Natural Science Foundation of China.

Wu's team has long studied the optical-electrical and electrical-optical physical mechanisms of new functional materials and related applications, such as solar cells and light-emitting diodes.

Organic-inorganic hybrid perovskitoid materials have excellent optoelectronic properties, such as tunable optical band gaps, high optical absorption coefficients, and low exciton dissociation energy, and are widely used in photovoltaics.