Multienergy x-ray detection and imaging enabled by working voltage regulating unipolar carrier collection in perovskite detectors
- Yuwei Li
- Xin Wang
- Yijing Ding
- Jingda Zhao
- Shilin Liu
- Yubing Xu
- Qi Cheng
- Ziyu Wei
- Damian Chinedu Onwudiwe
- Byung Seong Bae
- Mehmet Ertuğrul
- Ying Zhu
- Wenbo Ma
- Yang (Michael) Yang
- Wei Lei
- Xiaobao Xu
2025-07-23
Multienergy x-ray imaging can provide additional substance information beyond morphology in conventional energy-integration imaging. The predominant approach, single photon counting, sets stringent requirements on low x-ray flux and signal discrimination and prolongs imaging time. Here, we report on the design of unipolar n-i-n perovskite detectors for multienergy x-ray imaging. Systematic characterization validates electrons dominating carrier dynamics in detectors, and the distribution of generated electrons varies as x-ray energy along its penetrating direction, whereas working voltage can manipulate electron drift length, ensuring their selective collection for x-ray energy discrimination. Our multienergy imaging array adopts high-flux x-ray in a normal imaging system and realizes fast 4-energy-bins x-ray images. By introducing the σ( E i )/σ( E j )-related multienergy digital subtraction algorithm, the images successfully distinguish the substance of targets side by side or by stacking, representing a notable advancement over conventional energy-integration imaging technique.