Comprimento de transporte

Esquema mostrando o caminho livre no meio l e o comprimento de transporte l*

O comprimento de transporte em um meio fortemente difuso (notado l*) é o comprimento ao longo do qual a direção de propagação do fóton é aleatória.[1][2] É também chamado de comprimento de difusão, uma das propriedades mais importantes de qualquer material absorvedor para células fotovoltaicas.[3] Está relacionado ao caminho livre médio l pela relação:[4]

com g: o coeficiente de assimetria. ou cálculo da média do ângulo de dispersão θ sobre um grande número de eventos de dispersão.

g pode ser avaliado com a teoria de Mie.

Se g=0, l=l*. Um único espalhamento já é isotrópico.

Se g→1, l*→infinito. Um único espalhamento não desvia os fótons. Então a dispersão nunca se torna isotrópica.[5]


Este comprimento é útil para renormalizar um problema de espalhamento não isotrópico em um problema isotrópico, a fim de usar as leis de difusão clássicas (lei de Fick e movimento browniano).[6][7][8] O comprimento de transporte pode ser medido por experimentos de transmissão e experimentos de retroespalhamento.[9]

Ver também

Referências

  1. ↑ Horne, David S. (19 de maio de 2004). «Application of light scattering to monitor colloid stability». The Royal Society of Chemistry: 368–378. ISBN 978-0-85404-891-5. Consultado em 27 de setembro de 2023 
  2. ↑ «chickenscratchnotes/lighttransport.md at master · ikrima/chickenscratchnotes». GitHub (em inglês). Consultado em 27 de setembro de 2023 
  3. ↑ Awino, Celline; Barasa, Godfrey; Odari, Victor (1 de fevereiro de 2020). «Light induced degradation of the transport length of CH3NH3PbI3 studied by modulated surface photovoltage spectroscopy after Goodman». Organic Electronics. 105503 páginas. ISSN 1566-1199. doi:10.1016/j.orgel.2019.105503. Consultado em 27 de setembro de 2023 
  4. ↑ Ishimaru, A. (1978). «Wave Propagation and Scattering in Random Media». New York: Academic Press 
  5. ↑ Snabre, Patrick; Arhaliass, Abdellah (20 de junho de 1998). «Anisotropic scattering of light in random media: incoherent backscattered spotlight». Applied Optics (em inglês) (18). 4017 páginas. ISSN 0003-6935. doi:10.1364/AO.37.004017. Consultado em 27 de setembro de 2023 
  6. ↑ Mengual, O.; Meunier, G.; Cayré, I.; Puech, K.; Snabre, P. (1999). «TURBISCAN MA 2000: Multiple light scattering measurement for concentrated emulsion and suspension instability analysis». Talanta. 50 (2): 445–456. PMID 18967735. doi:10.1016/S0039-9140(99)00129-0 
  7. ↑ Snabre, Patrick; Arhaliass, Abdellah (1998). «Anisotropic scattering of light in random media: Incoherent backscattered spotlight». Applied Optics. 37 (18): 4017–26. Bibcode:1998ApOpt..37.4017S. PMID 18273374. doi:10.1364/AO.37.004017 
  8. ↑ Kuzmin, Dmitri. «Algebraic Flux Correction for Finite Element Approximation of Transport Equations». Berlin, Heidelberg: Springer Berlin Heidelberg: 345–353. ISBN 978-3-540-34287-8. Consultado em 27 de setembro de 2023 
  9. ↑ Mengual, O (13 de setembro de 1999). «TURBISCAN MA 2000: multiple light scattering measurement for concentrated emulsion and suspension instability analysis». Talanta (2): 445–456. doi:10.1016/S0039-9140(99)00129-0. Consultado em 27 de setembro de 2023 
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