Continuous Flash Sublimation of Inorganic Halide Perovskites: Enabling Industrially Compatible Deposition Rates

Despite the outstanding progress in performance of halide perovskite solar cell absorbers fabricated via vapor-based approaches, increasing deposition rate in these approaches has been neglected nearly completely. In fact, today’ deposition times for the fabrication of high performing absorbers are typically in the range of up to several hours, being orders of magnitude away from industrially reasonable deposition times. In this work, continuous flash sublimation of inorganic halide perovskite absorbers is introduced as a concept to overcome this fundamental limitation of state-of-the-art approaches. Solar cells employing flash-sublimed CsPbI2Br absorbers reach power conversion efficiencies as high as 12.3%, making them one of the most efficient and, with deposition times below five minutes, at the same time the fastest vapor-processed inorganic perovskite absorbers reported so far. Besides the promising performance and significantly higher deposition rates, the approach enables continuous deposition, thus, circumventing another major bottleneck of established vapor deposition approaches toward commercialization.