Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at https://www.ucl.ac.uk/finance/research/rs-contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
Flexible Bragg Reflectors for Efficient Deformable Luminescent Solar Concentrators
  • Publication Type:
    Conference presentation
  • Publication Sub Type:
  • Authors:
    Portnoi M, Sol C, Robbins T, Schlaefer J, Tummeltshammer C, Papakonstantinou I
  • Date:
  • Medium:
  • Name of Conference:
    2018 MRS Fall Meeting & Exibit
  • Conference place:
    Boston, MA, USA
  • Conference start date:
  • Conference finish date:
  • Language:
  • Addresses:
    University College London
    Department of Electronic and Electrical Engineering
    Roberts Building, Torrington Place
    WC1E 7JE
    United Kingdom
Structural flexibility of photovoltaic devices can lead to an expanse of applications such as wearable technologies, flexible electronics, self-powered sensors and roll-to-roll manufactured smart facades. Luminescent solar concentrators (LSCs) composed of flexible host matrices such as polydimethylsiloxane (PDMS) have been proposed as a means of providing this flexibility. The elastomer sheets doped with luminophores can be fabricated in a range of sizes, transparencies, colours and rigidities to the designer’s needs. This additional functionality can come at a cost to efficiency. Curvature results in increases in both reabsorption and escape cone losses. In this work we explore how curvature affects these losses and propose a solution for their mitigation. We investigate the effect of curvature on LSC efficiency by means of an experimentally verified Monte-Carlo model (MCM) for curved LSCs. We show that for large scale devices, the optimal concentrations of fluorophore concentrations at fixed thicknesses required to achieve the highest external optical efficiency differ for curved and flat LSCs. To mitigate escape cone losses, we propose flexible distributed Bragg reflectors (DBRs) consisting of alternating PDMS and PDMS-titanium composite thin films with a refractive index contrast of ~0.3. These DBRs are designed to have omnidirectional reflectivity in the spectral region of the emission of the luminophores but high transmission in the absorption region. We fabricate prototype DBRs and compare reflectance to transfer matrix model (TMM) calculations. Combining our MCM and TMM into a hybrid package we optimise the application of such DBRs to Lumogen Red 305 doped flexible LSCs and demonstrate the DBR effect on their efficiency. We then use the model to predict the full potential of this pairing. This work will pave the way for efficient and deformable LSCs. We plan to incorporate these into devices for use in everyday life.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Dept of Electronic & Electrical Eng
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by