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Numerical investigation of lead-free CsSnBr3 photodetector with activated carbon-based charge-extraction layer

Year: 2026
Type: article
Abstract: The toxicity of lead-based perovskites and interfacial recombination are significant barriers to the creation of high-performance, low-environmental-impact photodetectors. This work presents a systematic approach towards lead-free CsSnBr 3 -based photodetectors, coupled with an activated carbon interfacial charge-extraction layer, using numerical simulations by SCAPS-1D. The proposed FTO/CsSnBr 3 /AC/Au structure integrates the advantageous optoelectronic characteristics of CsSnBr 3 , with the conductive and passivating attributes of activated carbon, facilitating charge carriers’ extraction and reducing interfacial recombination. The enhanced device exhibits a significant photo-response, with a quantum efficiency exceeding 80% in the visible region with a spectral cutoff of 700 nm. The optimum responsivity is 257.6 mAW -1 , and the detectivity is 4.55×10 13 Jones at 400 nm wavelength of incident light. Dark current density and noise-equivalent power are significantly low, at 10 -7 mA/cm 2 and 2.12×10 -14 WHz -1/2 , respectively. Optimization of the absorber thickness, doping density, and AC layer properties is performed with precision to achieve an equilibrium between optical absorption, carrier collection, and noise suppression. These findings indicate that activated carbon could serve as an effective approach in interfacial engineering to improve the functionality of lead-free perovskite photodetectors. This study supports the systematic design of photodetectors exhibiting stability, high sensitivity, and environmental sustainability for implementation in the next-generation photodetectors.
DOI: 10.1016/j.mtcomm.2026.116538
Language: English
Open Access status: hybrid
Estimated APC paid: $2,830
OpenAlex ID: W7203868616
FWCI:
Cites: 42
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Related to: 10