resumo
Bi-based halide perovskites have been considered as alternatives to Pb-based perovskites with the intention of avoiding the use of lead in the field of photovoltaics. Over the last few years, novel Bi-based halide perovskites have shown potential in reaching good photovoltaic performance, as suggested by their similar electronic structure to Pb-based perovskites. Nevertheless, their lower dimensionality entails poor charge carrier transport. It has been consistently stated that the role of the A-site should be further studied. To explore this proposition, we have synthesized three different Bi-based halides with substitution on the A-site by azetidinium cations. In this contribution we report fundamental observations of azetidinium bismuth halides, [(CH2)3NH2]3Bi2I9, [(CH2)3NH2]3Bi2Br9, and [(CH2)3NH2]3Bi2Cl9 with prospects in optoelectronics and photovoltaics. These new materials exhibit 0D and 2D crystal structures at a molecular level and the optical feature of an excitonic band state.
palavras-chave
LEAD-FREE; BAND-GAP; SOLAR-CELLS; IODIDE; CS3BI2I9; CRYSTAL; RB; CS
categoria
Chemistry; Materials Science
autores
Jin, YU; Marler, B; Salak, AN; Escobar-Castillo, M; Benson, N; Lupascu, DC
nossos autores
Andrei Salak
Investigador PrincipalProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
A. N. S acknowledges the support of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PID-DAC). D. C. L., N. B., and Y. U. J acknowledge funding through the German Science Foundation (Deutsche Forschungsgemeinschaft, DFG) under project number 424708448. Fruitful discussions with Vladimir V. Shvartsman are highly acknowledged. Felix Niemeyer is acknowledged for his NMR measurements. Matthias Epple and Ivanna Kostina are acknowledged for the help of FT-IR measurement. Ulrich Hagemann is acknowledged for the help of Raman spectroscopy.