Synergistic energy system [Sm3+-Eu3+-Tm3+]:CsPbI2.4Br0.6 designing and thermal optimization for photovoltaic and electrical applications

Current work, for the first time elucidates the fabrication and energy applications of the novel perovskite hetero -system formed by the ternary lanthanide doping of CsPbI2.4Br0.6 leading to formation of [Sm3+-Eu3+-Tm3+]: CsPbI2.4Br0.6 (SET:CPVSK). SET:PVSK was tailored for the band gap spanning over the range of 1.59-1.66 eV over the course of 28 days, exhibiting excellent stability. With the cubic crystalline geometry, the spin coated thin films expressed maximum coverage and profound binding to substrate. As a perovskite light absorber, SET: CVSK based solar cell gained an efficiency of 17 % with the 68.92 % of fill factor and an expanded open circuit voltage (Voc) of 1.08 V. As an electro-catalyst, SET:CPVSK expressed moderate oxygen generation. While it demonstrated magnanimous pure hydrogen generation showing impressively minimal overpotential and Tafel slope value of 142 mV and 122.7 mV dec-1, respectively. With an extended service life in the electrolyte medium, SET:CPVSK adorned nickel foam electrode was marked by superior unit capacity of 661.24 mAH g-1 while the equivalent series resistance (Rs) i.e. 0.67 omega, which shows the minimal resistance and facilitated diffusion of ions.

Automated summary

This study elucidates the fabrication and energy applications of a novel perovskite hetero-system, SET:CPVSK, formed by ternary lanthanide doping of CsPbI2.4Br0.6. SET:CPVSK exhibits adjustable band gap range and excellent stability, showing potential applications in solar cells and electro-catalysts.