Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 4: Organic Photovoltaics: from Single Molecules to Devices

SYOP 4.66: Poster

Thursday, March 26, 2009, 16:30–19:00, P1A

Microwave photoconductivity of cadmium telluride doped by gallium studied at different temperatures — Alexander Marinin, •Nikolay Radychev, Gennadii Novikov, and Mikhail Gapanovich — IPCP RAS Chernogolovka Moscow region 142432

The number of charges reaching the electrodes is a key parameter for detector quality characterestics. Solid solutions of CdTe-GaTe are considered as a perspective medium for X-ray detection. The kinetics of photogenerated charges was studied at different temperatures and for different doping concentrations. The samples were made by CdTe and GaTe vacuum sintering. The sintering temperature and duration were 1010 K and 300 h, respectively. The microwave photoconductivity (f=36 GHz) was investigated. The temporal resolution of the experimental facility was decreased to 5 ns. Investigations were made in a wide temperature range, T=140-295 K. A nitrogen laser was used for photoexcitation. Generally, the experimental curves of the photoresponse P(t) consist of fast and slow components after switching of the laser light. The temperature and the Ga content were found to influence the form, amplitude and characteristical decay time of P(t) considerably. The photoresponse decay analysis shows that a self-compensation effect is present and this effect results in a decrease of the depth of traps. The active medium parameters take a turn for the better by this effect. This work was supported by RFFI 06-03-32725, 06-08-01510