Abstract:
The paper reviews a novel concept employing spectrally selective films for the passive cooling of flexible solar cells. This involves controlling visible transmittance and reflecting infrared radiation, reducing overall temperature without additional weight or moving parts. Spectrally selective filters with dielectric layers (TiO2, WO3, ZnO, ZnS) combined with noble metal coatings (Ag, Au) allow visible light transmission while reflecting infrared radiation. The study examines Dielectric/Metal/Dielectric(D/M/D) films coated on glass and flexible substrates (PEN, PET). By varying parameters like thickness and refractive index, the optical properties of these films can be tailored for high visible transmittance (Tvis) and solar infrared reflectance (Rsi). The significance of this review lies in bridging the gap in the literature related to passive cooling for flexible solar cells. The findings contribute to understanding and adopting flexible solar cell technology in portable electronics and wearable applications.
Keywords: Passive cooling,
Selective filters,
Dielectric,
Flexible solar cells,
Substrate
Recieved: 02.03.2026,
Revised: 08.04.2026,
Accepted: 15.05.2026
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