High-Sensitivity Perovskite γ-Ray Detectors Enhanced by Device Engineering Toward Energy Spectroscopy Imaging.

Perovskite-based detectors for γ-rays have emerged relatively recently and have attracted limited attention. Although increasing efforts are being directed towards their development, the absence of an adaptive processor, systematic theoretical framework, and various applications limit its further development. In this paper, drawing inspiration from the commercial detectors, electrode configuration is improved to reshape the bias electric field, guide the effective signal carrier, and mitigate the noise from the side section. Through theoretical analysis, simulations, and experimental comparisons, the clear improvement of energy resolution from 7% to ≈5% is demonstrated, and the highest resolution of 1.9% is observed. Furthermore, to fill up the research framework of radiation, the definition of X-ray sensitivity is extended to quantitatively describe the γ-ray response, and assess the performance of γ-ray detectors, reaching a sensitivity ≈10 µC Gy cm. Based on these, a spectral-enhanced imaging strategy is proposed to broaden the application of γ-Ray detectors, where the spectral dimension of images is utilized to improve contrast and enhance imaging quality.