Study On Flexible Organic Solar Cells Based On PI/AgNW

The development and application of energy technology affect the progress of the world.Among many kinds of energy,renewable energy is widely concerned because of its cleanness,sustainable development and other good characteristics.As one of the most widely used renewable energy,solar energy provides inexhaustible energy for the world.In addition to photothermal conversion,photoelectric conversion is the most effective way to use solar energy.Solar cell is the perfect application of photoelectric conversion.In recent years,people pay more attention to flexible thin film solar cells,among which the flexible and transparent solar cells have a broader application potentiality,such as solar curtains,wearable electronic devices,etc.,which are new solar cell applications with great future.In this paper,firstly,the development of flexible polyimide(PI)substrate and the application of PI/ AgNW transparent conductive film formed by the combination of PI and AgNW in photovoltaic devices are systematically described.The reason that the AgNW plasma resonance enhances light absorption in solar cells is discussed.Secondly,PI film was synthesized and a transparent PI/ AgNW flexible electrode was prepared by us.Then,the finite difference time domain(FDTD)method is used to verify the enhanced light absorption effect of AgNW in flexible solar cells.The optical simulation analysis of AgNW's effect in solar cells as a cathode or an anode is carried out.The position of related energy levels is measured.It is concluded that PI /AgNW electrode is more suitable for the cathode of flexible solar cells.Finally,a flexible semitransparent cell based on PI/ AgNW cathode was fabricated.The double-sided efficiency of the device was 3.88% and 3.23%,respectively,and the transmittance was 33.8%.In order to reveal the reasons of the different double-sided efficiencies in the device,the optical simulation and electrical measurements were carried out in-depth,and the summary conclusions were given.The light transmittance of the semitransparent device is higher than that of the commercial application requirement of solar windows(25%),and the efficiency usingnonfullerene acceptor can be further improved,showing the bright prospect of PI/AgNW in the future applications of photovoltaic building integration or wearable electronics.