Visible light photodetectors using all-evaporated, inorganic perovskite layers

In recent years, lead halide perovskites have gained a lot of interest from the scientific community because of their remarkable optoelectronic properties, such as defect tolerance, high absorption coefficient, and long charge carrier lifetime. Most research efforts have been directed towards perovskite-based solar cells, which have demonstrated impressive power conversion efficiencies, comparable to the ones achieved by traditional silicon solar cells. On top of that, the raw materials used for perovskite synthesis are abundant and inexpensive, reducing this way the cost and complexity of large-scale production. These promising features have opened the way for the use of perovskites in more applications, such as photodetectors, LEDs, and lasers. 
 
Our group specializes in the fabrication and characterization of all-inorganic perovskite photodetectors deposited via thermal evaporation. All-inorganic perovskites (such as CsPbI¬2Br) exhibit improved chemical stability and are more resilient at high temperatures, in contrast to their organic counterparts (such as MAPbI3). In addition, while most research groups focus on solution-based methods like spin-coating, our group utilizes vacuum thermal evaporation for depositing perovskite layers. This method ensures the formation of layers with greater purity and uniformity — qualities that are highly desirable for industrial applications.  
 
For the past 5+ years, our group has been extensively studying the properties and growth conditions of evaporated perovskite layers. Currently, we are exploring new strategies for further decreasing the dark current and prolonging the shelf life of the fabricated photodetectors. The next major milestone would be to develop a fully evaporated perovskite-based imager, using a silicon Read-Out Integrated Circuit (ROIC), that was previously developed in-house. Thus, the goal of the internship/master’s thesis project will be focused on helping us achieve this milestone. After a short period of training, the selected candidate will be able to work independently in a lab and fab environment and fabricate microelectronic devices from start to finish.  On top of that, the candidate will gain experience in a wide variety of optical, structural, and electrical measurements. An international team of experienced researchers will be present to provide continuous support and guidance. The ideal candidate is a hands-on person in a lab environment, with a proven record of problem-solving and data analysis. 

Type of Project: Combination of internship and thesis 

Master's degree: Master of Engineering Technology; Master of Engineering Science; Master of Science 

Duration: 6 - 9 months

For more information or application, please contact Athina Papadopoulou (athina.papadopoulou@imec.be)

Imec allowance will be provided for students studying at a non-Belgian university.