Spin-coating silicon-quantum-dot ink to improve solar cell efficiency

The optical and electrical properties of quantum dots (QDs) have generated great interest in the use of QDs for photovoltaics. The optical coupling of QDs with currently manufactured solar cells is one of the most promising photovoltaic applications of QDs. Here we demonstrate that by spin-coating Si-QD ink at the solar cell surface the efficiency of screen-printed Si solar cells may be improved. The enhancement of solar cell efficiency results from the porous Si-QD film induced increase of light absorption. The solar cell efficiency may be further improved as the efficiency of down-shifting short-wavelength light to red light by Si-QDs increases.

By spin-coating silicon-quantum-dot (Si-QD) ink at the solar cell surface the efficiency of commercially produced Si solar cells may be improved. The enhancement of solar cell efficiency results from the porous Si-QD film induced increase of light absorption. The solar cell efficiency may be further improved as the efficiency of down-shifting short-wavelength light to red light by Si-QDs increases.Figure optionsDownload as PowerPoint slideHighlights
► Silicon quantum dots (Si-QDs) form porous films at the surface of Si solar cells.
► The porous Si-QD film induced increase of light absorption leads to the enhancement of solar cell efficiency.
► The solar cell efficiency may be further improved as required down-shifting efficiency of Si-QDs is reached.