Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 182, Issue -, Pages 331-338Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2018.04.004
Keywords
Thin film luminescent solar concentrator (LSC); Dye; Absorption coefficient; Re-absorption; Resonant energy transfer (RET); Non-linear properties; Optical efficiency
Funding
- Higher Education Authority (HEA), Ireland under the Postgraduate R & D skills programme - European Research Council under the project Plasmonic Enhancement and Directionality of Emission for Advanced Luminescent Solar Devices (PEDAL) [639760]
- Science Foundation Ireland
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This research article studied absorption coefficient dependent losses and efficiency of thin film luminescent solar concentrator (LSC). The optimum absorption coefficient was determined by fabricating red dye doped thin film LSCs with varying absorption coefficients of 24-202 cm(-1). The optical, electrical, and ray-trace model predicted results were compared to establish the optimum absorption coefficient for fabricated thin film LSCs. The optical and electrical efficiencies of thin film LSCs are a function of absorption coefficient; follow linearly at lower values, gradually becoming non-linear at higher values of absorption coefficient which restricts the overall efficiency. The multi layered ray-trace model predicted results deviated from the experimental results at high absorption coefficient. Non-linearity was introduced by losses mechanism of re-absorption, resonant energy transfer (RET), and scattering in thin film LSCs. Re-absorption losses were found to be dependent on optical path length and absorption coefficient of thin film. They were identified and quantified through locally collected emission and optical path-length in thin film LSCs. Re-absorption losses caused a red shift in emission peak by approximate to 20 nm as the absorption coefficient increased from 24 to 202 cm(-1). RET decreased fluorescence life time of dye from 5 ns to 2 ns for the absorption coefficient increased from 24-202 cm(-1). These absorption coefficient dependent losses limit the optical and electrical efficiency of thin film LSC devices, and compared with bulk LSC.
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