Emergent Upconversion Sustainable Micro‐Optical Trapping Device

Abstract Ultrathin‐thickness single‐junction Si‐based solar cells can be developed to enhance photoelectric conversion efficiency (PECE) approaching to Shockley–Queisser limit. However, loss of short circuit current is a crucial factor that dramatically affects PECE improvement. Even though many studies have focused on rare reflector architecture for facilitating near‐infrared radiation absorption, PECE is still constraint due to its fabrication cost. Herein, an upconversion sustainable micro‐optical trapping device is reported. Using a systematic procedure, a high upconversion performance core–shell‐nanoparticles (CSNPs) structure is synthesized. Accordingly, silica diatom microporous frustule is a good electromagnetic field localization chamber, upon which CSNPs are embedded through a microassemble synthesis. This emerging device can be support on ultrathin‐thickness single‐junction Si‐based solar cells as a rare absorber with its low preparation cost. In the experiment, CSNPs upconversion optical density by surface plasmon resonance of Au nanoparticle's enhancement can be increased five‐time greater than NaYF 4 without SiO 2 coating. A finite difference time domain simulation and real color luminescence images in this study are also demonstrated.