The Study On The All-Solution Preparation Of Polymer Solar Cells

Polymer solar cells is a relatively lower cost, more simple process and better flexible photovoltaic devices than inorganic solar cells, is an important project on using of renewable clean energy, which is competing for research laboratories worldwide. The main work of this thesis is on exploring the preparation of polymer solar cells technology, the introduction of "all solution" and to study the impact of modified layer on the device. We expecte to improve device performance. It's mainly summarized as follows:Firstly, the technology study on the Al as the cathode of the device:P3HT as the donor material, PCBM as the acceptor material, prepared the standard device on structure ITO/P3HT:PCBM/Al, through introducing the active layer between ITO and PEDOT:PSS, we improve performance of the standard device, and to find the best conditions on the device through studying and exploring the different temperature treatment and thickness of the active layer. Experiments show that, introduction of PEDOT:PSS can greatly enhance the device performance, and 180 degrees for 10 minutes of annealing treatment and the thickness of 70nm of the active layer are the best conditions, having the best fill factor and conversion efficiency.Secondly, "all solution" processed of cell device:As electrical conductivity of the PEDOT:PSS increased to 790 s/cm, it has an ability to be electrode, so we prepared the polymer solar cells device on ITO as cathode and PEDOT:PSS anode. Inquiry proved that the use of dispensing PEDOT:PSS can prepared the device on the conversion efficiency of 1.7%. There are no evaporation process on the whole process, and we can save a lot of preparation time of the device, decrease the cost and improve the work efficiency.Thirdly, study on the impact of electrode modification on the device:TiOx is not only the optical spacer layer but also the hole blocking layer. In view of the shady roles of TiOx, we study the modification of different positions and the impact on different thickness of TiOx, and then study the role of ZnO and Cs2CO3 in the device performance. Experiments show, TiOx of 10nm can play a good role of hole blocking layer, however, the role of optical spacer is on the suspecting stage, without obtaining the agreement with the theoretical data, and still further explored; The film of Cs2CO3 in the device can reduce the work function of ITO, while the special structure of ZnO film can increase the contact area between active layer and the electrode, expand the transfer path of electron, and can improve the device performance.