Progress on the Development of Inorganic Lead-Free Perovskite Solar Cells

Bandgap engineering of a lead-free defect perovskite Cs3Bi2I9through trivalent doping of Ru3+

“…Recently perovskite materials have attracted great attention for their promising applications in optoelectronic devices such as solar cells, light emitting diodes, and photodetectors. [1][2][3][4][5][6] In particular, the photoelectron conversion efficiency (PCE) of hybrid organic-inorganic perovskite solar cells (PSCs) has increased rapidly since 2009, 7 reaching more than 22% up to date. 8 However, the toxicity and instability of these conventional alkylamine-based PSCs have greatly restricted their larger scale production outside laboratories.…”

DFT Investigation of Structural Stability, Optical Properties, and PCE for All-Inorganic Csx(Pb/Sn)yXz Halide Perovskites

“…In general, B-γ-CsSnI 3 is more favorable in photovoltaic application, relying on its suitable band gap (1.3 eV), light absorption coefficient as high as 10 4 cm –1 , low exciton binding energy (18 meV), and high hole mobility (∼600 m 2 ·V –1 ·s –1 ). − Although CsSnX 3 perovskites present the superiority in chemical stability to moisture, heat, and light, their spontaneous phase transition should be considered . For example, CsSnI 3 can easily change from the orthorhombic phase (B-γ-CsSnI 3 ) to a chain structure (Y-CsSnI 3 ) at room temperature; unfortunately, Y-CsSnI 3 is barely effective in photovoltaic cells . Therefore, we introduce Goldschmidt tolerance factor t to estimate the stability of perovskite compounds; furthermore, a comprehensive and systematic study on structures and properties of CsPbX 3 /CsSnX 3 is imperative and was completed in this work to overcome the cognitive confusion and one-sided understanding of the entire system.…”

“…25 For example, CsSnI 3 can easily change from the orthorhombic phase (B-γ-CsSnI 3 ) to a chain structure (Y-CsSnI 3 ) at room temperature; unfortunately, Y-CsSnI 3 is barely effective in photovoltaic cells. 26 Therefore, we introduce Goldschmidt tolerance factor t 27 to estimate the stability of perovskite compounds; furthermore, a comprehensive and systematic study on structures and properties of CsPbX 3 /CsSnX 3 is imperative and was completed in this work to overcome the cognitive confusion and one-sided understanding of the entire system.…”