MPI Semiconductor Laboratory

München, Germany

MPI Semiconductor Laboratory

München, Germany
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Weidenspointner G.,MPI Semiconductor Laboratory | Andritschke R.,MPI Semiconductor Laboratory | Aschauer S.,PNSensor GmbH | Erdinger F.,University of Heidelberg | And 10 more authors.
IEEE Nuclear Science Symposium Conference Record | Year: 2012

The DSSC (DEPFET Sensor with Signal Compression) is a new instrument with non-linear compression of the input signal in the sensor and with parallel signal processing (filtering, linear amplification, and digitization) for all pixels. The DSSC will serve as 2d imaging detector at the European X-ray Free Electron Laser (XFEL.EU) currently under construction in Hamburg, Germany. The DSSC design goal is to achieve at the same time single photon detection and high dynamic range of about 104 photons, both for photon energies down to 0.5 keV and read-out speeds up to 4.5 MHz. Realization of this goal requires an accurate calibration of the non-linear system response (NLSR) over the full dynamic range of the detector. We present our strategy for calibrating the NLSR, for each of the 1024×1024 DSSC pixels, in the laboratory. The feasibility of our calibration strategy is demonstrated experimentally by calibrating the NLSR of a DSSC prototype set-up consisting of a prototype DEPFET sensor with non-linear signal compression connected to a prototype read-out ASIC. © 2012 IEEE.


Weidenspointner G.,MPI Semiconductor Laboratory | Weidenspointner G.,Max Planck Institute for Extraterrestrial Physics | Andritschke R.,MPI Semiconductor Laboratory | Andritschke R.,Max Planck Institute for Extraterrestrial Physics | And 15 more authors.
IEEE Nuclear Science Symposium Conference Record | Year: 2012

The DSSC (DEPFET Sensor with Signal Compression) is a new instrument with non-linear compression of the input signal in the sensor and with parallel signal processing (filtering, linear amplification, and digitization) for all pixels. The design goal is to achieve at the same time single photon detection and high dynamic range, both for photon energies down to 0.5 keV and read-out speeds up to 4.5 MHz. Realization of this goal requires an accurate calibration of the non-linear system gain (NLSG), i.e. of the non-linear dependence of the digital DSSC output signal on the input signal charge generated by incident photons, over the full dynamic range of the detector. We present an overview of our basic strategy for calibrating the NLSG. The feasibility of our calibration strategy is demonstrated using our system simulation package, which is briefly described. Finally, we demonstrate the DSSC capabilities by simulating the measurement of a T4 virus diffraction image as recorded at the Linac Coherent Light Source. © 2011 IEEE.


Treis J.,MPI Semiconductor Laboratory | Treis J.,MPI for Solar System Research | Andricek L.,MPI Semiconductor Laboratory | Aschauer F.,MPI Semiconductor Laboratory | And 21 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2010

Focal plane instrumentation based on DEPFET Macropixel devices, being a combination of the DetectorAmplifier structure DEPFET with a silicon drift chamber (SDD), has been proposed for the MIXS (Mercury Imaging X-ray Spectrometer) instrument on ESA's Mercury exploration mission BepiColombo. MIXS images X-ray fluorescent radiation from the Mercury surface with a lightweight X-ray mirror system on the focal plane detector to measure the spatially resolved element abundance in Mercury's crust. The sensor needs to have an energy resolution better than 200 eV FWHM at 1 keV and is required to cover an energy range from 0.5 to 10 keV, for a pixel size of 300×300μm2. Main challenges for the instrument are radiation damage and the difficult thermal environment in the mercury orbit. The production of the first batch of flight devices has been finished at the MPI semiconductor laboratory. Prototype modules have been assembled to verify the electrical properties of the devices; selected results are presented here. The prototype devices, Macropixel prototypes for the SIMBOL-X focal plane, are electrically fully compatible, but have a pixel size of 0.5×0.5 mm2. Excellent homogeneity and near Fano-limited energy resolution at high readout speeds have been observed on these devices. © 2010 Elsevier B.V. All rights reserved.


Granato S.,MPI Semiconductor Laboratory | Andritschke R.,MPI Semiconductor Laboratory | Andritschke R.,Max Planck Institute for Extraterrestrial Physics | Elbs J.,MPI Semiconductor Laboratory | And 9 more authors.
IEEE Transactions on Nuclear Science | Year: 2013

The eROSITA (extended Roentgen Survey with an Imaging Telecope Array) instrument on the satellite Spektrum-Roentgen-Gamma will perform an all-sky survey as well as pointed observations in the low and medium X-ray energy regime. The seven PNCCD detectors for this instrument have been developed and manufactured at the Max Planck Institute (MPI) Semiconductor Laboratory. We summarize the characterization of this type of PNCCD regarding the spectral redistribution function in the photon energy range from 100 eV to 11 keV. We present the results of Geant4 simulations compared to our measurements. The observed spectral features and their physical origin inside the detector are explained. An overview on the different contributions to the energy resolution of the detector is given. © 1963-2012 IEEE.


Ebermayer S.,MPI Semiconductor Laboratory | Andritschke R.,MPI Semiconductor Laboratory | Elbs J.,MPI Semiconductor Laboratory | Meidinger N.,MPI Semiconductor Laboratory | And 6 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

For the eROSITA X-ray telescope, which is planned to be launched in 2012, detectors were developed and fabricated at the MPI Semiconductor Laboratory. The fully depleted, back-illuminated pnCCDs have an ultrathin pn-junction to improve the low-energy X-ray response function and quantum efficiency. The device thickness of 450 μm is fully sensitive to X-ray photons yielding high quantum efficiency of more than 90% at photon energies of 10 keV. An on-chip filter is deposited on top of the entrance window to suppress visible and UV light which would interfere with the X-ray observations. The pnCCD type developed for the eROSITA telescope was characterized in terms of quantum efficiency and spectral response function. The described measurements were performed in 2009 at the synchrotron radiation sources BESSY II and MLS as cooperation between the MPI Semiconductor Laboratory and the Physikalisch-Technische Bundesanstalt (PTB). Quantum efficiency measurements over a wide range of photon energies from 3 eV to 11 keV as well as spectral response measurements are presented. For X-ray energies from 3 keV to 10 keV the quantum efficiency of the CCD including on-chip filter is shown to be above 90% with an attenuation of visible light of more than five orders of magnitude. A detector response model is described and compared to the measurements. © 2010 SPIE.


Lechner P.,PNSensor GmbH | Andricek L.,MPI for Physics | Andricek L.,MPI Semiconductor Laboratory | Aschauer S.,PNSensor GmbH | And 13 more authors.
IEEE Nuclear Science Symposium Conference Record | Year: 2012

One of the X-ray imaging detectors in development for the European XFEL (X-ray Free Electron Laser) is the DSSC (DEPFET Sensor with Signal Compression). The DSSC sensor array will have a format of 1024 X 1024 pixels with a pixel size in the order of 200 μm. It is optimized for the detection of low-energy X-ray photons and designed to operate at frame rates up to 4.5 MHz with a dynamic range of several thousand photons per pixel and frame and single photon resolution at small photon numbers. The DSSC system's core component is an active pixel sensor based on the DEPFET (DEpleted P-channel Field Effect Transistor) structure. A DEPFET is an integrated detector-amplifier combining internal amplification, full sensitivity over the whole bulk thickness, analog data storage, readout on demand, low serial noise, and absence of reset noise. For the DSSC-adaptation of the DEPFET principle the new feature of signal compression has been added, i.e. the device has a high gain at small signals and a reduced gain at large signals. With this strongly non-linear response the DSSC-DEPFET provides the required high charge handling capacity with simultaneous single photon resolution for low-energy X-rays. This paper presents the concept of the DSSC-DEPFET. Its functionality is demonstrated by measurements of a first series of prototypes. © 2011 IEEE.


Granato S.,Max Planck Institute for Extraterrestrial Physics | Granato S.,MPI Semiconductor Laboratory | Andritschke R.,Max Planck Institute for Extraterrestrial Physics | Andritschke R.,MPI Semiconductor Laboratory | And 10 more authors.
IEEE Nuclear Science Symposium Conference Record | Year: 2012

The eROSITA instrument on the satellite Spektrum-Roentgen-Gamma will perform an all-sky survey as well as pointed observations in the low and medium X-ray energy regime. The 7 PNCCD detectors for this instrument are developed and manufactured at the MPI Semiconductor Laboratory. We summarize the characterization of this type of PNCCD regarding the spectral redistribution function in the photon energy range from 100 eV to 11 keV. We present the results of Geant4 simulations compared to our measurements. We explain the observed spectral features and their origin inside the detector. © 2011 IEEE.

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