Selective optical contacting for solar spectrum management

Jianfeng Yang*, Weijian Chen, Bo Wang, Zhilong Zhang, Shujuan Huang, Santosh Shrestha, Xiaoming Wen, Robert Patterson, Gavin Conibeer

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


Solar spectrum management using up/down conversion is an important method to improve the photovoltaic energy conversion efficiency. It asks for a monochromatic luminescence absorption at the band edge of the photovoltaic device to reduce both the sub-band-gap and over-band-gap energy losses. Here, we demonstrate an energy selective optical contacting concept to improve the luminescence transfer efficiency for spectrum management. By increasing both the luminescence emission and re-absorption ability through photonic resonance, an efficient photon transfer channel could be established between the luminescence emitter and the photovoltaic component in a near-field region. This concept is not only able to compensate the insufficient band edge absorption ability of the photovoltaic device, but also to break the far-field limitation of luminescence radiation. The energy selection on the optical spectrum naturally imposed by the mode resonance is also helpful to improve the monochromaticity of the luminescence yield. In this paper, a photonic crystal cavity is used to realize the optical contacting concept between a thin silicon film and spectrum converter. The optical power and photon flux transferred between different components are calculated analytically using the electromagnetic Green's function. The corresponding radiative dipole moment is estimated by the fluctuation-dissipation theorem. The example shows an over 80 times enhancement in the luminescence absorbance by the silicon layer, illustrating the great potential of this concept to be applied on nano-structured photovoltaic devices.

Original languageEnglish
Title of host publicationPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices VI
EditorsAlexandre Freundlich, Laurent Lombez, Masakazu Sugiyama
Place of PublicationBellingham, WA
Number of pages6
ISBN (Electronic)9781510606401
ISBN (Print)9781510606395
Publication statusPublished - 2017
Externally publishedYes
EventPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices VI 2017 - San Francisco, United States
Duration: 30 Jan 20171 Feb 2017

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferencePhysics, Simulation, and Photonic Engineering of Photovoltaic Devices VI 2017
Country/TerritoryUnited States
CitySan Francisco


  • solar cell
  • spectrum management
  • near-field
  • photonic crystal cavity


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