First operation of a pixel imaging matrix based on DEPFET pixels

In the DEPFET pixel concept the detected incident radiation is directly sensed and amplified by a JFET integrated in every pixel cell. While the DEPFET detector principle has already been demonstrated previously on single pixel structures, we present here the first successful operation of a large 32×32 DEPFET pixel matrix as an imaging device. The matrix has been exposed to 60 keV gamma rays of a 241 Am source and has been scanned using an IR laser. The principle of operation as well as the charge collection in the structure and possible improvements are discussed.