Light-induced lattice expansion leads to high-efficiency perovskite solar cells

Abstract

Light-induced structural dynamics plays a vital role in the physical properties, device performance, and stability of hybrid perovskite-based optoelectronic devices. We report that continuous light illumination leads to a uniform lattice expansion in hybrid perovskite thin films, which is critical for obtaining high-efficiency photovoltaic devices. Correlated, in situ structural and device characterizations reveal that light-induced lattice expansion benefits the performances of a mixed-cation pure-halide planar device, boosting the power conversion efficiency from 18.5 to 20.5%. The lattice expansion leads to the relaxation of local lattice strain, which lowers the energetic barriers at the perovskite-contact interfaces, thus improving the open circuit voltage and fill factor. The light-induced lattice expansion did not compromise the stability of these high-efficiency photovoltaic devices under continuous operation at full-spectrum 1-sun (100 milliwatts per square centimeter) illumination for more than 1500 hours.

Photostability of MAPbI3 Perovskite Solar Cells by Incorporating Black Phosphorus

“…However, compared with MAPbI 3 ‐based device, the MAPbI 3 /BP‐based devices exhibited significant enhancement in photostability when tested in a N 2 glovebox under continuous white LED illumination (100 mW cm −2 ). The PV performance of the MAPbI 3 ‐based devices declined rapidly and finally dropped to ≈30% of its initial PCE value after continuous 1000 h illumination, which is similar to some earlier results . Surprisingly, the MAPbI 3 /BP‐based device can maintain 94% of its original PCE after 1000 h continuous illumination.…”

Management of Crystallization Kinetics for Efficient and Stable Low‐Dimensional Ruddlesden–Popper (LDRP) Lead‐Free Perovskite Solar Cells

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Much effort devoted in photovoltaic field, including material optimization, structural optimization, and interface engineering, has allowed the power conversion efficiency (PCE) of perovskite solar cells (PSCs) quick increase to 23.3%, [18] which is comparable to state-of-the-art commercial photovoltaic techniques, such as silicon and other thin-film solar cells. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Much effort devoted in photovoltaic field, including material optimization, structural optimization, and interface engineering, has allowed the power conversion efficiency (PCE) of perovskite solar cells (PSCs) quick increase to 23.3%, [18] which is comparable to state-of-the-art commercial photovoltaic techniques, such as silicon and other thin-film solar cells.…”

Role of Water and Defects in Photo‐Oxidative Degradation of Methylammonium Lead Iodide Perovskite

“…Thus, concerns have recently been turned to the long‐term operational stability of perovskite solar cells in ambient conditions . Unfortunately, organic–inorganic halide perovskites (e.g., MAPbI 3 ) are very sensitive to many factors, such as heat, moisture, light, oxygen, electric‐field, and mechanical stress . Understanding the degradation induced by these factors at the atomic level will lay important foundation for the development of proper protection schemes to realize the long‐term stability of perovskite‐based solar cells.…”