Spectrally Complementary Tandem Luminescent Solar Concentrators: Optical, Electrical and Stability Assessment

Authors:
Preprint
Publisher website
Google Scholar
Abstract
Improving the efficiency and long-term stability of luminescent solar concentrators (LSCs) remains a challenge for their practical application in building-integrated photovoltaics (BIPV). In this work, laminated LSCs based on a blue-emitting resin and orange-emitting dispersed in an ethylene-vinyl acetate (EVA) matrix were fabricated and systematically investigated. The optical properties, distance-dependent photon propagation, photovoltaic performance, and short-term outdoor stability of the individual LSCs were evaluated and compared with those of tandem architecture. The orange-emitting LSC exhibited a larger Stokes shift (≈135 nm) than the blue-emitting resin LSC (≈80 nm), indicating reduced spec-tral overlap and lower self-absorption losses. Outdoor exposure demonstrated excellent short-term stability for the blue-emitting resin LSC, whereas the orange-emitting device ex-hibited a progressive decline in photovoltaic performance. The tandem architecture broadened the spectral harvesting range, achieving a maximum optical efficiency of 8.09%, a power conversion efficiency of 0.306%, a short-circuit current density of 0.283 mA cm⁻², an open-circuit voltage of 1.9 V, and a fill factor of 56.7% when illuminated from the or-ange-emitting LSC side. These findings demonstrate that combining spectrally comple-mentary luminophores in tandem architecture is an effective strategy for broadening solar spectrum utilization and enhancing the optical and photovoltaic performance of LSCs for BIPV applications.

This publication has 22 references indexed in Scilit: