Noise spectroscopy study of methylammonium lead tribromide single-crystal detectors: gamma spectroscopy applications
Résumé
Metal halide perovskites have been studied since 2016 for gamma spectroscopy applications. In this work, we study devices based on methylammonium lead tribromide single crystals as gamma detectors. These detectors can measure the signal of a single gamma photon but the energy resolution is limited by the noise of the detectors. Such noise is multicomponent and a deeper investigation was carried by measuring the noise power spectral density of the devices for different bias voltages. Non-biased devices were found to behave as an idealized equivalent electrical circuit with the main noise source being thermal noise. In the case of biased devices, the dominant noise source is shown to be the 1/f noise which becomes preponderant at lower frequency (<1MHz). These results demonstrate the major contribution of the flicker noise in perovskite detectors and lay the foundation for next developments to make them compatible with spectrometric applications.
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