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University of Saskatchewan

1. Ramaswami, Kieran Oliver 1994-. MONTE CARLO SIMULATION OF DRIFTING CHARGE CARRIERS IN PHOTOCONDUCTIVE INTEGRATING DETECTORS.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/12290

Semiconductors behaviour is often assumed and modelled under small signal conditions. One of the most common properties used to describe semiconductors is their collection efficiency (CE) the most common model being the Hecht collection efficiency model (HCE)η₀. HCE and its modified expressions for exponential absorption have been widely used in time-of-flight type transient photoconductivity experiments as well as in the assessment of the sensitivity of integrating-type radiation detectors. However, the equations apply under small signals in which the internal field remains uniform (unperturbed) while electron hole pairs (EHPs) move in the semiconductor. In this thesis I have used Monte Carlo simulation of the continuity, trapping rate and Poisson equations to calculate the collection efficiency ηᵣ (CCE). Each injected carrier is tracked as it moves in the semiconductor until it is either trapped or reaches the collection electrode. Trapped carriers do not contribute to the photocurrent but continue to contribute to the field through the Poisson equation. The instantaneous photocurrent iph(t) is calculated from the drift of the free carriers through the Shockley-Ramo theorem. iph(t) is integrated over the duration of the photocurrent to calculate the total collected charge and hence the collection efficiency hr. hr has been calculated as a function of the charge injection ratio r, the electron and hole ranges (drift mobility and lifetime products, μτ), mean photoinjection depth δ and drift mobility ratio b. The deviation of the collection efficiency hr from the uniform field case η₀, in the worst case, can be as much as 30% smaller than the small signal model prediction. However, for a wide range of electron and hole schubwegs and photoinjection ratios, the typical error remained less than 10% at full injection, the worst case. The present study provides partial justification for the wide-spread use of the uniform field collection efficiency η₀ formula in various applications, even under high injection conditions.
*Advisors/Committee Members: Kasap, Safa, Johanson, Robert, Degenstein, Doug, Dinh, Anh, Chen, Li.*

Subjects/Keywords: Monte Carlo; photodetector; semiconductor; trapping; schubweg; collection efficiency; Hecht collection effciency; Coulomb; electric field

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APA (6^{th} Edition):

Ramaswami, K. O. 1. (2019). MONTE CARLO SIMULATION OF DRIFTING CHARGE CARRIERS IN PHOTOCONDUCTIVE INTEGRATING DETECTORS. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12290

Note: this citation may be lacking information needed for this citation format:

Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^{th} Edition):

Ramaswami, Kieran Oliver 1994-. “MONTE CARLO SIMULATION OF DRIFTING CHARGE CARRIERS IN PHOTOCONDUCTIVE INTEGRATING DETECTORS.” 2019. Thesis, University of Saskatchewan. Accessed September 21, 2019. http://hdl.handle.net/10388/12290.

Note: this citation may be lacking information needed for this citation format:

Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^{th} Edition):

Ramaswami, Kieran Oliver 1994-. “MONTE CARLO SIMULATION OF DRIFTING CHARGE CARRIERS IN PHOTOCONDUCTIVE INTEGRATING DETECTORS.” 2019. Web. 21 Sep 2019.

Vancouver:

Ramaswami KO1. MONTE CARLO SIMULATION OF DRIFTING CHARGE CARRIERS IN PHOTOCONDUCTIVE INTEGRATING DETECTORS. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2019 Sep 21]. Available from: http://hdl.handle.net/10388/12290.

Note: this citation may be lacking information needed for this citation format:

Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ramaswami KO1. MONTE CARLO SIMULATION OF DRIFTING CHARGE CARRIERS IN PHOTOCONDUCTIVE INTEGRATING DETECTORS. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12290

Not specified: Masters Thesis or Doctoral Dissertation