New Methods to Produce and Extend the Spectral Range of Photocathodes for Large Area Photodetectors with mm scale Space Resolution (Final Report)
- Cornell Univ., Ithaca, NY (United States)
Cornell group has developed recipes to grow photocathodes belonging to the alkali antimonide family using evaporation from elemental sources with and without line of sight between the sources and the glass substrate. Photocathodes were characterized in terms of their quantum efficiency in the spectral range covering the visible and the near infrared part of the spectrum. Two different approaches have been used to demonstrate the growth of high quantum efficiency photocathodes: the first approach makes use of elemental antimony and alkali metals loaded into ceramic crucibles hosted into effusion cells like the one used in molecular beam epitaxy reactors; whereas in the second approach the antimony film is evaporated onto the transparent substrate using effusion cells and then transferred into a different reaction chamber where exposure to the alkali metals coming from an elemental source lacking the line of sight to the substrate is used to produce the photocathode material. The research conducted opens the exploration of alternative methods for the synthesis of photocathodes specifically designed to be implemented over large areas maximizing the production throughput and lowering the cost. It particular, this research can benefit future HEP programs by providing new methods that can be adopted to produce photon detectors for future experiments.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- SC0011643
- OSTI ID:
- 1530157
- Report Number(s):
- DOE-CORNELL-0011643
- Country of Publication:
- United States
- Language:
- English
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