Short-Wavelength Light Conversion And Rainwater Power Generation Integration In Silicon-based Photovoltaic Cells

Silicon-based solar cells have undergone rapid development,enabling cost-effective electricity generation through improved efficiency and reduced cost.However,while recent research has extensively focused on expanding applications,stability,and efficiency improvements,the current efficiency of these cells has approached their limits.Here,two types of solar cells based on commercial silicon cells:quantum dot downconversion solar cells and dual-functioning weather-adaptive solar cells.For silicon heterojunction solar cells,we address the parasitic absorption problem at the short wavelength end and introduce quantum dot materials as down-conversion layers to convert short-wavelength photons to longer-wavelength photons,thus improving cell efficiency.We also modify the hydrophilicity/hydrophobicity of the cell surface using hexamethyldisilazane to enable inkjet printing of colored patterns on large-area cells,enhancing both the efficiency and visual appeal of the silicon heterojunction solar cells.For tunnel oxide passivated contact cells,we exploit the potential of the post-component potential-induced attenuation effect to enhance the efficiency of frictional nanogenerators.This design enables a weather-adaptive solar cell that operates as a frictional nanogenerator on rainy days and a solar cell on sunny days,without interfering with each other in a limited space.The main contents of this paper are as follows:Chapter 1 provides an overview of the working principles of solar cells,their applications in building-integrated photovoltaics,the issue of potential-induced attenuation of cell components,and a brief introduction to frictional nanogenerators.Chapter 2 investigates inkjet printing ink and substrate treatment for solar cells.We prepare inkjet printing ink using commercial silicon heterojunction solar cells as substrates,incorporating CdSe quantum dots with high luminescence quantum yields.After inkjet printing and depositing an MgFx anti-reflection layer,we obtain silicon heterojunction solar cells that are more efficient and colorful.Chapter 3 focuses on quantum dot down-conversion solar cells.We discuss the choice of quantum dots and solar cell substrates in detail.We then investigate the effects of quantum dot thickness and refractive index and analyze optical losses using commercial software,Lumerical FDTD.Finally,we propose formulas for calculating EQE and current density for quantum dot down-conversion cells.Chapter 4 presents an integrated device that combines commercial silicon solar cells and frictional nanogenerators.We use fluorocarbon materials commonly found in cell packaging to construct the nanogenerator.Unlike other integrated devices that only enhance optical gain,we show that the potential-induced attenuation effect that occurs when cells are connected in series can also enhance the efficiency of frictional nanogenerators,expanding the range of applications and practicality of this integrated device.Chapter 5 summarizes the paper and provides an outlook on the future applications of solar cells.