Low-Cost Lanthanum Nickel Manganese Oxide-Based Photodetector With PCBM and CuI Transport Layers for Eco-Friendly Applications.

In this article, an environmentally benign lead-free double-perovskite photodetector with a configuration of FTO/PCBM/La2NiMnO6/CuI/carbon has been proposed. The proposed design configuration has been numerically analyzed using SCAPS-1D to develop a high-performance photodetector by optimizing absorber thickness, acceptor doping, defect density, and interfacial quality. LNMO (lanthanum nickel manganese oxide) acts as an absorber that exhibits a high absorption coefficient greater than 100,000 cm-1 in the visible-NIR region and possesses favorable band alignment with PCBM (phenyl-C61-butyric acid methyl ester) and CuI (copper (I) iodide) material for efficient charge extraction with reduced recombination. It gives a peak responsivity of 0.62 A W-1 at wavelengths of 800-840 nm and a detectivity of 1.1 × 1015 Jones under optimized parameters, 1-μm absorber with NA ≈ 1016 cm-3, Nt ≈ 1014 cm-3. The temperature and interface-trap analyses, therefore, highlighted thermal robustness and the dominant role of interfacial recombination in limiting performance. Thus, the obtained results indicated that proposed La2NiMnO6-based double-perovskite structures integrated with sustainable transport layers act as a promising low-toxicity path toward stable and cost-efficient photodetectors for applications in optical communication, imaging, and environmental sensing.