The project consists of four technical work packages and two work packages for creating impact and managament. The technical work packages are desicribed briefly below.
- WP1: Improved and validated models for PQEDs. The aim of this workpackage is to develop and validate improved 3D models of the internal quantum deficiency (IQD) of induced-junction photodiodes at room and cryogenic temperatures to an uncertainty of 10 % of its value. The improved models will be applied to new induced-junction photodiodes manufactured in WP2 and to PQEDs assembled from these photodiodes.
- WP2: Material research for improved PQEDs. This work package focuses on researching different passivation materials and fixed charge increasing methods in order to manufacture possibly the best induced-junction photodiodes to date. Manufactured batch of optimized photodiodes will be fed into WP1 for charcterisation and to WP4 for applications. In addition, commercially available bare-chip photodiodes will be delivered to WP3 for self-calibration packaging and WP4 for early exploitation and experience.
- WP3: Instrumentation and packaging for self-calibration. The goal of this work package is to develop the robust metrology grade packaging technologies that enable self-calibrating photodiodes to be operated both as a PQED and an electrical substitution radiometer. The photodiodes should be operated in both aforementioned modes of operation with sufficient sensitivity and equivalence between optical and electrical heating over a temperature range of 20 K to 300 K. This workpackage will deliver packaged photodiode modules to WP4.
- WP4: Self-calibration at room and cryogenic temperatures. This work package aims to develop the tools and measurement procedures for self-calibration of dual mode photodiodes at room and cryogenic temperatures to an uncertainty below 0.05 % and 1 ppm, respectively. With the supporting theoretical and pratical work from other work packages, self-calibration will be performed at cryogenic temperature, demonstrating the capability of reaching an uncertainty below 1 ppm.