Cavity-controlled radiative recombination of excitons in thin-film solar cells

Vuong, Luat T.; Kozyreff, Gregory; Betancur, Rafael; Martorell, Jordi
December 2009
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p233106
Academic Journal
We study the performance of photovoltaic devices when controlling the exciton radiative recombination time. We demonstrate that when high-quantum-yield fluorescent photovoltaic materials are placed within an optical cavity, the spontaneous emission of the radiative exciton is partially inhibited. The corresponding increase of the exciton lifetime results in an increase of the effective diffusion length and diffusion current. This performance maximizes when the thickness of the cell is comparable to the absorption length. We show that when typical parameter values of thin solar-cell devices are used, the efficiency may improve by as much as three times.


Related Articles

  • Quantization of longitudinal excitons in CuCl thin films. Silva-Castillo, A.; Pe´rez-Rodrı´guez, F. // Journal of Applied Physics;10/1/2001, Vol. 90 Issue 7, p3662 

    The quantization of the exciton translational motion in CuCl thin films, having a thickness much less than the photon wavelength and overlying a substrate, is theoretically investigated by employing the 45° reflectometry. We show that the resonances associated with quantized longitudinal...

  • Mirrorless optical bistability of an ultrathin glassy film built up of oriented J-aggregates: Effects of two-exciton states and exciton-exciton annihilation. Glaeske, H.; Malyshev, V. A.; Feller, K.-H. // Journal of Chemical Physics;2/1/2001, Vol. 114 Issue 5 

    We theoretically analyze the optical response of an ultrathin film with accounting for the effects of creating two exciton states as well as their annihilation in an individual aggregate. We show that these two processes do not violate mirrorless optical bistability of the film found in the...

  • Comment on “Influence of biaxial strains on the vibrational and exciton energies in ZnO” [J. Appl. Phys. 96, 289 (2004)]. Gil, Bernard // Journal of Applied Physics;10/15/2005, Vol. 98 Issue 8, p086114 

    Comments on the influence of biaxial strains on the vibrational and exciton energies in zinc oxide films. Details on the magnitude of the spin-orbit interaction parameters; Accounts on the value of the crystal-field splitting parameter; Examination of the optical properties of the semiconductor...

  • Changes in Optical Properties of Molecular Nanostructures. Vučenović, S. M.; Šetrajči7#x0107;, J. P.; Markoski, B.; Mirjanić, D. Lj.; Pelemiš, S.; Škipina, B. // Acta Physica Polonica, A.;May2010, Vol. 117 Issue 5, p764 

    This paper represents an overview about exciton systems in the molecular nanostructures (ultra thin films and superlattices) and their implications on optical properties, primarily on absorption coefficient, which is given in the form of dielectric permittivity. With utilization of Green's...

  • Growth-Temperature-Controlled Optical Properties of Textured Mg xZn1− xO Thin Films. Wei, W.; Jin, C.; Narayan, R.J. // Journal of Electronic Materials;Apr2009, Vol. 38 Issue 4, p613 

    Pulsed laser deposition was used to grow magnesium zinc oxide thin films on amorphous fused silica substrates at several temperatures between room temperature and 750°C. In this study, the effect of growth temperature on the optical properties of textured Mg xZn1− xO thin films was...

  • Red photoluminescence and optical absorption in hydrogen-treated GeO[sub 2]-SiO[sub 2].... Simmons, K.D.; Potter Jr., B.G. // Applied Physics Letters;5/9/1994, Vol. 64 Issue 19, p2537 

    Investigates the effects of post-deposition, reducing atmosphere heat treatment on the optical absorption and photoluminescence of thin films. Use of the sol-gel process in producing the films; Correlation of the intensity of photoluminescence bands to heat-treatment time; Association of...

  • Band gap energy in nanocrystalline ZrO[sub 2]:16%Y thin films. Kosacki, Igor; Petrovsky, Vladimir; Anderson, Harlan U. // Applied Physics Letters;1/18/1999, Vol. 74 Issue 3, p341 

    Presents the results of optical absorption measurements on nanocrystalline ZrO[sub 2]:16%Y thin films. Microscopic structure and energy levels attributed to the band structure and lattice defects; Energy gap of nanocrystalline ZrO[sub 2]:16%Y thin films; Optical absorption spectra of the thin...

  • Photoconducting and photovoltaic studies on some chemically deposited (Cd-Zn)S & (Cd-Pb)S films. Chandra, T.; Bhushan, S. // Journal of Materials Science;Oct2004, Vol. 39 Issue 20, p6303 

    Results of photoconductivity (PC) rise-decay and excitation spectra, optical absorption spectra and photovoltaic (PV) studies are presented for some (Cd-Zn)S & (Cd-Pb)S films, prepared in presence of CdCl2 as flux and La & Pr as impurities. The nature of rise and decay curves are discussed and...

  • Absorption of Frenkel Excitons in PTCDA Thin Films, in PTCDA/Alq3 Multilayers and in Co-deposited Films. Gangilenka, V. R.; DeSilva, A.; Wagner, H. P.; Schmitzer, H.; Scholz, R.; Kampen, T. U. // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p357 

    We investigate the optical densities of polycrystalline PTCDA thin films, PTCDA/Alq3 multilayers and of co-deposited films in the temperature range from 10 to 300 K. The measurements provide information about microscopic interactions between molecules and the effect of strain within the organic...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics