Inorganic perovskites improved film and crystal quality of CsPbIBr2 when doped with rubidium

Abstract

In this work CsPbIBr2 is doped with rubidium, where up to 12% of caesium atoms are replaced with those of rubidium. The obtained Cs1-xRbxPbIBr2, x= (0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12), films were characterized by X-ray diffraction (XRD), the scanning electron microscope (SEM), photo-luminescence (PL) and UVvisible spectroscopy. The integration of Rb + ions into the lattice leads to a detectable change in optoelectronic and morphological structure. Substituting 6% of caesium atoms yields the best results, eliminating pinholes, and elevating crystallite size and absorption coefficient by 116% and 125%, respectively. Other novel observations, of particular interest, include a slight increase in band-gap energy from 2.1eV to 2.14eV, and a decrease in stability. Over a period of 15 days, where temperature and relative humidity kept at 23°C and 20% respectively, a larger amount of degradation was seen to take place as rubidium content was increased. Therefore, the doping of CsPbIBr2 with rubidium is most useful in the case where specifically film and crystal quality are desired to be targeted.

Panchromatic oxasmaragdyrin as dual functional hole‐transporting material in all‐inorganic CsPbIBr2 perovskite solar cells

“…Nonetheless, CsPbIBr 2 PSCs still suffer from several shortages such as low film coverage and high defect density and hence require additional optimizations. Various literature has reported different approaches to improve active layers, [7][8][9][10][11][12][13] for example, complementing the perovskite active layer with organic dopants such as poly(ethylene glycol), cellulose acetate, or organic iodic salts etc. [14][15][16] Other than modifications of the active layers, engineering transporting layers to improve the efficiency of CsPbIBr 2 -based PSCs has been addressed.…”

Enhancing the stability and crystallinity of CsPbIBr2 through antisolvent engineering

“…and Mn 2? [21,33]. Moreover, CsPbIBr 2 films have been deposited via: one-step spin coating [30,31,34], a gas-assisted method [35], a spray-assisted method [25], a two-step spin coating method [21] and by dual-source thermal evaporation [15].…”