Enhancing the Efficiency of Production CdS/CdTe PV Modules by Overcoming Poor Spectral Response at Short Wavelengths Via Luminescence Down-Shifting

Bryce S. Richards, Keith R. McIntosh
2006 2006 IEEE 4th World Conference on Photovoltaic Energy Conference  
Many commercially-produced photovoltaic (PV) modules exhibit poor external quantum efficiency (EQE) at short wavelengths (λ). However, the addition of a luminescent down-shifting (LDS) layer can absorb these short λ photons that would not have contributed towards electron-hole pair generation in the solar cell, and re-emit them at longer λ where the PV device possesses a much higher IQE. The LDS is performed via a mixture of up to four fluorescent organic dyes, which are cheap, photostable, and
more » ... p, photostable, and exhibit near-unity luminescence quantum efficiencies (LQE). Ray-tracing simulations in this paper demonstrate that an LDS layer containing three dyes can significantly enhance the short-circuit current density (Jsc) of cadmium sulphide/cadmium telluride (CdS/CdTe) solar cells by ∆Jsc = 3.1 mA/cm 2 , corresponding to an increase in conversion efficiency (η) from η = 9.6% to η = 11.2% under air-mass 1.5 global (AM1.5g) solar radiation. Significantly, the application of LDS layers does not require any alteration to the structure of the solar cell.
doi:10.1109/wcpec.2006.279420 fatcat:un47nzkombe53gdwsbhbmj5wzy