Iago López-Fernández, Donato Valli, Chun Yun Wang, Subarna Samanta, Takuya Okamoto, Yi Teng Huang, Kun Sun, Yang Liu, Vladimir S. Chirvony, Avijit Patra, Juliette Zito, Luca De Trizio, Deepika Gaur, Hong Tao Sun, Zhiguo Xia, Xiaoming Li, Haibo Zeng, Iván Mora-Seró, Narayan Pradhan, Juan P. Martínez-Pastor, Peter Müller-Buschbaum, Vasudevanpillai Biju, Tushar Debnath, Michael Saliba, Elke Debroye, Robert L.Z. Hoye, Ivan Infante, Liberato Manna, Lakshminarayana Polavarapu Advanced Functional Materials 2023年
Halide perovskites, in the form of thin films and colloidal nanocrystals, have recently taken semiconductor optoelectronics research by storm, and have emerged as promising candidates for high-performance solar cells, light-emitting diodes (LEDs), lasers, photodetectors, and radiation detectors. The impressive optical and optoelectronic properties, along with the rapid increase in efficiencies of solar cells and LEDs, have greatly attracted researchers across many disciplines. However, most advances made so far in terms of preparation (colloidal nanocrystals and thin films), and the devices with highest efficiencies are based on Pb-based halide perovskites, which have raised concerns over their commercialization due to the toxicity of Pb. This has triggered the search for lower-toxicity Pb-free halide perovskites and has led to significant progress in the last few years. In this roadmap review, researchers of different expertise have joined together to summarize the latest progress, outstanding challenges, and future directions of Pb-free halide perovskite thin films and nanocrystals, regarding their synthesis, optical spectroscopy, and optoelectronic devices, to guide the researchers currently working in this area as well as those that will join the field in the future.