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Related Experiment Video

Updated: Jan 18, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Published on: July 18, 2015

Semitransparent Photovoltaics via Reflection Optical Paths.

Yiming Wang¹, Xiangjun Zheng¹, Yifan Wu^2,3

¹State Key Laboratory of Silicon and Advanced Semiconductor Materials, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|September 13, 2025

Summary

This summary is machine-generated.

Semitransparent photovoltaics (STPVs) achieve high visible light transmission and power generation using a novel reflective design. This reflective STPV (R-STPV) technology offers a new path for sustainable solar windows in buildings.

Keywords:

building integrated photovoltaic optical path reflection semitransparent photovoltaic solar energy

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Published on: July 18, 2015

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Area of Science:

Materials Science
Renewable Energy
Optoelectronics

Background:

Semitransparent photovoltaics (STPVs) are promising for building integration but face challenges balancing light transmission and power generation.
Existing STPV designs often involve trade-offs between optical properties and energy conversion efficiency.

Purpose of the Study:

To propose and demonstrate a reflective STPV (R-STPV) structure that overcomes the limitations of traditional transmission-based STPVs.
To enable high-performance, wavelength-selective STPVs using various photovoltaic materials for building-integrated applications.

Main Methods:

Designed a dual-surface reflection optical path to achieve equivalent light transmission.
Developed an optical reflector that selectively reflects visible light and transmits invisible light.
Integrated the reflector with high-performance photovoltaic materials like silicon, CIGS, and CdTe.

Main Results:

Demonstrated high-performance R-STPVs with optimized optical geometry.
Achieved a 14.4% efficiency, 92.2% average visible light transmittance, and a 13.28% light utilization efficiency in the best silicon-based R-STPV.
Recorded an exceptional color rendering index of 99% for the R-STPV windows.

Conclusions:

The R-STPV design bypasses reflection losses and reduces stringent requirements for active layers, allowing versatile material choices.
R-STPV window technology is suitable for diverse building-integrated scenarios, with simulated annual power generation of 69.8 kWh/m².
This work presents a significant advancement for high-performance solar windows, contributing to energy sustainability.