Organic–inorganic perovskites with intriguing optical and electrical properties have attracted significant research interests due to their excellent performance in optoelectronic devices. Recent efforts on preparing uniform and large-grain polycrystalline perovskite films have led to enhanced carrier lifetime up to several microseconds. However, the mobility and trap densities of polycrystalline perovskite films are still significantly behind their single-crystal counterparts. Here, a facile topotactic-oriented attachment (TOA) process to grow highly oriented perovskite films, featuring strong uniaxial-crystallographic texture, micrometer-grain morphology, high crystallinity, low trap density (≈4 × 1014 cm−3), and unprecedented 9 GHz charge-carrier mobility (71 cm2 V−1 s−1), is demonstrated. TOA-perovskite-based n-i-p planar solar cells show minimal discrepancies between stabilized efficiency (19.0%) and reverse-scan efficiency (19.7%). The TOA process is also applicable for growing other state-of-the-art perovskite alloys, including triple-cation and mixed-halide perovskites.
Bibliographical noteFunding Information:
D.H.K. and J.P. contributed equally to this work. The work at the National Renewable Energy Laboratory was supported by the U.S. Department of Energy under Contract No. DE-AC36-08GO28308. K.Z. and D.H.K. acknowledge the support from the U.S. DOE SunShot Initiative under the Next Generation Photovoltaics 3 program (DE-FOA-0000990). G.R. and J.P. acknowledge support from the Solar Photochemistry program within the U.S. DOE, Office of Basic Sciences, Office of Science. J.J.B., Z.L., and M.Y. acknowledge the support by the hybrid perovskite solar cell program of the National Center for Photovoltaics funded by the U.S. DOE, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office. J.Y.K. and I.J.P. acknowledge the support from the Nano Material Technology Development program (2012M3A7B4049989) of the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning.
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- carrier mobility
- perovskite films
- solar cells
- topotactic-oriented attachment