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Electron/hole generation within an thin solar cell film
Posted 2013年4月8日 GMT-4 21:03 Modeling Tools & Definitions, Parameters, Variables, & Functions Version 3.5a, Version 5.2a 0 Replies
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I'm trying to simulate charge carrier generation within an organic solar cell thin film now (assuming the film is homogeneous). I'm using only three equations now,
1. electron drift-diffusion (convection and diffusion mode)
2. hole drift-diffusion (convection and diffusion mode)
3. Poisson's equation (electrostatic mode)
(as attached)
Boundary conditions:
1. For electron drift-diffusion: all boundaries of the film are insulating
2. For hole drift-diffusion: all boundaries are insulating
3. For Poisson's equation: both top and bottom of the film are grounded, all the side walls are zero charge.
(With a time-dependent solver) Starting with equal hole and electron concentration in the bulk, I'm confused why I always end with a concentration gradient rather than a homogeneous distribution of hole and electrons within the film (pictures attached). Does anybody have any ideas of what's happening? Thanks!
Guozheng
PS. total net charge concentration was set as difference between hole and electron concentration
Attachments:
Hello Guozheng Shao
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