生物高分子DNA薄膜具有良好的可见光透过率，一定的导电性，同时DNA分子上的极性磷酸根离子，能够形成表面偶极子，从而改变界面的功函数，是一种新型优良的光电器件阴极界面材料。目前，用作光电器件的新型界面材料，DNA还有一些问题需要研究，主要有：1、DNA的导电性需要提高。2、DNA的功函数需要进一步的调节。3、其应用于光电器件中的物理机理不甚清楚。本项目拟将二维材料(石墨烯、MXene)、纳米银(Ag)、染料(N719、罗丹明)掺入生物高分子DNA中，制备出新型DNA复合材料。期待高电导石墨烯、MXene的添加能提高DNA复合材料的导电性；期待染料的掺入提高DNA复合材料的光生载流子浓度，从而提高复合材料的导电性。拟引入电负性低的碱金属(Li、K、Rb、Cs)至DNA材料中，期待利用碱金属低的电负性调节DNA材料的功函数。利用多种测量技术探究DNA复合材料对太阳电池性能影响的物理机理及规律。

Bio-polymer DNA film has good visible light transmittance and proper electrical conductivity, at the same time, the polar phosphoric acid ions on the DNA molecule can form the surface dipole, thus changing the work function of the interface surface, DNA is a new type of excellent cathode interface material of photoelectric device. At present, as a new type of interface material for optoelectronic devices, there are still some problems to be studied. The main include: 1. The conductivity of DNA needs to be improved. 2. The function of DNA needs to be further regulated. 3. The physical mechanism of its application in optoelectronic devices is not clear. This project proposes to prepare new DNA composites by adding two-dimensional materials (Graphene, MXene), nano-silver (Ag), dyes (N719, Rhodamine) into biopolymer DNA. It is expected that the addition of high conductivity graphene and mxene can improve the conductivity of DNA composites. It is expected that dyes will be added to increase the photo-generated carrier concentration of DNA composites, thus improving the conductivity of composites. DNA-alkali metal composites are prepared by introducing alkali metals (Li, K, Rb, Cs) to DNA materials with low electro-negative nature. It is expected to regulate the work function of DNA materials by using the low electro-negative nature of alkali metals. The physical mechanism and law of the influence of DNA composites on the performance of solar cells will be investigated by a variety of measurement techniques.