Halide Semiconductor Detector Buffer Layer Against Anode Degradation

A buffer layer is introduced as an intermediary component between the halide semiconductor and the metallic anode. This buffer layer prevents direct contact and chemical reaction between halide ions and the metallic anode, while still allowing electrical conduction. The buffer layer acts as a protective mediator that resolves the contradiction between achieving electrical conduction and preventing harmful chemical reactions.

The detector structure is transformed from a simple two-layer configuration (halide semiconductor + metallic anode) to a composite three-layer structure by incorporating a buffer layer with specific properties. This composite structure combines the electrical conductivity of the metallic anode with the protective characteristics of the buffer layer, preventing halide ion degradation while maintaining electrical functionality.

The buffer layer serves as an intermediary that allows charge transport functionality while preventing the harmful accumulation effect. It mediates between the need for halide ion migration (for charge transport) and the need to prevent halide ion accumulation (for device stability), enabling both functions to coexist.

The harmful aspect of halide ion accumulation and reaction is extracted and isolated from the system by introducing the buffer layer. The buffer layer captures and contains the halide ions, preventing them from reacting with the metallic anode, while still allowing the essential charge transport function to occur.