【摘要】 射线光子计数探测在医疗诊断、航天和环境监测等领域有重要的应用。钙钛矿是一种新型的光电材料，它对γ射线光子具有优秀的吸收和光电转换特性。本文以高品质钙钛矿晶体作为γ射线光子吸收体，利用溶液外延掺杂的方法生长钙钛矿晶体半导体结。通过调控晶体杂质浓度，使钙钛矿本征层获得很高的电位降落，并利用超厚的本征层充分吸收γ射线光子；通过本征层两侧的p型和n型薄层建立适当的阻挡势垒，抑制暗态载流子的注入，从而降低探测器的暗电流和噪声。研究结果表明，通过溶液法外延掺杂制备钙钛矿晶体γ射线光子计数探测器，可以明显抑制γ光子探测噪声和暗电流，具有较高的γ光子能量以及同位素源活度的识别能力。更多还原

【Abstract】 γ ray photon counting has many important applications in the medical diagnostics, aerospace, and environment monitoring. Perovskite is a novel optoelectronic material, and provides excellent absorption and conversion for γ photons. In this paper, the high quality perovskite crystal is used as absorber of γ ray. The pn/p-i-n junction is formed by the solution processed doping and epitaxial growth. To optimize the dopant concentration, the main voltage drop can be measured cross the intrinsic layer. The dark current and noise can be suppressed effectively by the build-in field of the depletions. As the experimental results shown, the γ-ray photon counting with perovskite junction shows good performance for detection of the activity of isotope source and detection of energy of γ photons.更多还原