【作者】 王俊；

【导师】 张继华； 刘黎明；

【作者基本信息】 电子科技大学 ， 工程硕士（专业学位）， 2017， 硕士

【摘要】 钙钛矿太阳能电池因其具备工艺简单、效率高、成本低等优点,是一种极具发展前景的新型太阳能电池,已经成为当前太阳能电池技术领域的研究热点。其中,平面异质结型钙钛矿太阳能电池具有可低温制备且与柔性器件制备工艺兼容的特点而备受关注。目前平面异质结型钙钛矿太阳能电池研究主要集中在钙钛矿薄膜沉积工艺的改进、新型空穴传输层材料的开发、界面修饰层的研究等方面。本文在掌握平面异质结型钙钛矿太阳能电池制备技术的基础上,重点开展其界面修饰层研究,以提高器件的性能和稳定性。此外,我们将石墨烯及其衍生物作为空穴传输层引入到平面异质结型钙钛矿太阳能电池中,并初步开展了基于石墨烯透明电极的柔性钙钛矿太阳能电池的研究。主要研究内容和研究结果如下:(1)阳极界面修饰研究。为了改善电池阳极与相邻膜层的能级匹配,将MoO3作为阳极界面修饰层,插入到ITO阳极和空穴传输层PEDOT:PSS之间,其中MoO3通过热蒸发法沉积制备,电池结构为:ITO/MoO3/PEDOT:PSS/MAPbI3/PCBM/Ag。结果表明,MoO3修饰层的引入,一方面提高了PEDOT:PSS在基底上的覆盖率并减缓了PEDOT:PSS对ITO电极的腐蚀,提高了器件的稳定性,另一方面也提高了空穴的提取效率,进而提升了电池的光电转换效率。(2)阴极缓冲层研究。为了进一步提高钙钛矿太阳能电池的电子收集效率,将溶液法制备的sBCP、sBphen作为阴极缓冲层,引入到电子传输层PCBM和Ag电极之间,对阴极界面进行优化,采用的器件结构为:ITO/PEDOT:PSS/MAPbI3/PCBM/(sBCP or s Bphen)/Ag。结果表明,阴极缓冲层可以起到增强了电子收集能力,提高了电池的光电转换效率,而且同时阻挡Ag原子向电池内部扩散的作用,提高电池的稳定性。(3)石墨烯及其衍生物的钙钛矿电池应用研究。尝试将氧化石墨烯作为空穴传输层、或将其与PEDOT:PSS组成双空穴传输层用于钙钛矿太阳能电池。发现氨化处理可以提高氧化石墨烯的导电性,有利于其空穴传输层的应用。此外,采用CVD法生长的单层石墨烯作为透明电极初步开展了柔性钙钛矿电池的研究。更多还原

【Abstract】 As a kind of promising new solar cells,perovskite solar cells have become current investigation focus in solar cell technology field due to their advantages including easy fabrication,high efficiency,and low cost.Among perovskite solar cells,the planar heterojunction perovskite solar cells can be prepared by using process compatible with the manufacture of flexible devices under relative low temperature.At present,the study of heterojunction perovskite solar cells is mainly focused on the improvement of perovskite thin film deposition process,the exploration of new hole transport layer materials,the modification study of interface layer and so on.The preparation method of planar heterojunction perovskite solar cells was studied in the paper firstly.Then we focused on the improvement of the performance and stability of the solar cells by interface layer modification.In addition,we introduced graphene and its derivatives as a hole transport layer into planar heterojunction perovskite solar cells,and carried out the preparation of flexible perovskite solar cells based on graphene transparent electrode.The main work and results are as follows:(1)The study of anode interface modification.In order to improve the energy level matching between the anode and the adjacent layer.Then MoO3 anode interface thin films were introduced to the solar cells with structure of ITO/ MoO3/ PEDOT:PSS /MAPb I3/PCBM/Ag.MoO3 anode interface thin films were prepared by thermal evaporation method.The results show that MoO3 modification improves the coverage of PEDOT:PSS on ITO substrates and blocks the corrosion of ITO electrode by PEDOT:PSS,which benefit for the improvement of the stability of the device and the elevation of the hole extraction efficiency.(2)The study of cathode buffer layer.In order to further improve the electron collection efficiency of perovskite solar cell.The sBCP and sBphen prepared by the solution method were used as the cathode buffer layer and introduced as the interface between the PCBM electron transport layer and the Ag electrode.The device structure was adopted as follows: ITO/PEDOT:PSS/MAPbI3/PCBM/(sBCP or SBphen)/Ag.The results show that the cathode buffer layer can play a role in blocking the diffusion of Ag atoms into the solar cells,improving the stability of the solar cells,increasing the electron collection capacity and elevating the PCE of the solar cells.(3)The application study of graphene and its derivatives in perovskite solar cells.We tried to use graphene as a hole transport layer,or use it with PEDOT: PSS to form a double hole transport layer for perovskite solar cells.It is found that the ammoniation treatment could improve the conductivity of graphene oxide and benefit its application as hole transport layer.In addition,monolayer graphene synthesized by CVD technology were used preliminarily as transparent electrodes for flexible perovskite solar cells.更多还原