Radiometric characteristics of new diamond PIN photodiodes

Abstract

New PIN photodiode devices based on CVD diamond have been produced showing high responsivity in a narrow bandpass around 200 nm. A set of measurement campaigns was carried out to obtain their XUV-to-VIS characterization (responsivity, stability, linearity, homogeneity). The responsivity has been measured from the XUV to the NIR, in the wavelength range of 1 nm to 1127 nm (i.e. 1240 to 1.1 eV). The diamond detectors exhibit a high responsivity of 10 to 30 mA W−1 around 200 nm and demonstrate a visible rejection ratio (200 nm versus 500 nm) of six orders of magnitude. We show that these PIN diamond photodiodes are sensitive sensors in the 200 to 220 nm range, stable under brief irradiation with a good linearity and homogeneity. They will be used for the first time in a solar physics space instrument LYRA, the Large Yield RAdiometer.

Rectifying properties and photoresponse of CVD diamond p(i)n‐junctions

“…This value is only one order of magnitude lower than reported in literature for a 5 mm in diameter pin-diode which has more than two orders higher active area [6]. As it is much harder to get high quality large area HPHT diamond substrates, this directly influences the structural condition of the layers grown upon them, and thus also their (photo)electrical properties.…”

“…The low response to visible light compared to UV light, makes the use of filters for the visible part of the spectrum obsolete, enhancing the overall signal to noise ratio [4]. In the second half of 2009, the Proba2 satellite will be launched, containing a solar UV radiometer (LYRA) [5] based on diamond photodiodes [6] and photoconductors [7]. This paper investigates the influence of the intrinsic layer thickness on the current-voltage characteristics and the photoresponse of single crystal CVD diamond p(i)ndiodes, comparing results with promising large area polycrystalline pn-junctions.…”

Degradation assessment of LYRA after 5 years on orbit - Technology Demonstration -

“…8, diamond PIN photodiodes are slightly sensitive to the onboard LEDs although they exhibit a high rejection ratio of almost six orders of magnitude between 200 and 500 nm [9]. The stability of the (sub-bandgap) photoresponse when illuminated with the LEDs (e.g., 18±2 DN with the VIS LED, cf inset of Fig.…”

“…The sequence is first applied to the nominal unit 2 and to the first backup unit 3, after which this is repeated with unit 1. For LYRA, two types of diamond detectors had been developed by IMOMEC (University of Limburg, Belgium): metal-semiconductormetal (MSM) photoconductors [8] and PIN (with the n-doped layer on top) photodiodes [9]. Si-AXUV photodiodes were selected as reference detectors [10] for comparison with the newly developed diamond devices.…”

Calibration of space instruments at the Metrology Light Source

“…This can be realized either by spectral filtering (using band pass filters) or designated detector devices based on certain materials like e.g. AlGaN, SiC, or diamond [18],. The spectral characterization of reflecting, transmitting, and dispersive optical elements (mirrors, filters, gratings) can additionally be conducted at the respective beamlines using a reflectometer.…”