Stable and highly sensitive photodetectors based on perovskite materials

Materials from the class of organo-metal halides (shortly called perovskites) are becoming one of the most promising for optoelectronic applications. In recent years, they have demonstrated an amazing increase in the efficiency of converting solar energy into electricity in solar cells (up to 22%). In addition to solar cells, perovskite photodetectors have also achieved remarkable results in terms of the values of their main parameters. 

In the case of photodetectors, detection indicators at the level of illuminance pW/cm2 and response times on the order of hundreds of nanoseconds have already been achieved. However, like perovskite solar cells, photodetectors suffer from unsatisfactory stability of the perovskite material, which means that the performance of the device easily degrades when exposed to air or moisture, which is further exacerbated by the conditions of continuous illumination. Compared to solar cells, photodetectors have even higher requirements for operational stability, not only in terms of their detection capability and sensitivity, but also in terms of linearity of response and noise level. Therefore, materials with better stability and reliability are needed for long-term operation while still maintaining their sensitivity. Sub-micron perovskites, fabricated by stacking perovskite layers with longer organic molecules, can offer ways to solve the stability problem. Since there is a lack of systematic characterization and analysis of the efficiency of sub-micron perovskite photodetectors, the present project proposes such a study.