Fabrication Of Indium-free Transparent Electrodes And Printed Polymer Solar Cells

Polymer solar cells become the hot filed in the due to its light, flexional characteristics.Tranditional polymer solar cells are often based on a transparent ITO glass electrode with small area of device. The spin coating method and easily brittle problem of ITO transparent electrode become the bottleneck of the development of polymer solar cells. In order to combine solar cell research and the appropriate acquisition modeof device, roll to roll printing preparation ITO-free thin-film solar cell device has become a goal of this research and the main content. Research on this issue, the authors explore through three sections. Firstly, as for the structure of a conventional device, the main goalsare improving the wet processing possibilityand simplifying device structure. MoO3 nanoparticles of 15 nm are prepared by hydrothermal processing, in aid of the dispersant to achieve a solution prepared MoO3 anode interface layer so as to avoid the traditional vacuum deposition process for preparing an anode interface layer. For simplifying the device structure by introducing a highly crystalline small molecule F4 TCNQ into the classic P3HT:PC60BM active layer, since F4 TCNQ can interact strongly with P3 HT donor, thereby inducing beneficial heterojunction device, and a phase separation of crystalline for efficient structure. With this modification, avoiding thermal annealing and simplifies the device structure are achieved.Further, the study attempts to prepare new solar cell glass based on new transparent electrode. By introducing highly dispersed MoS2 nanosheetsinto silver nanowires conductive ink can be effectively suppressed settlement phenomenon of silver nanowires, and MoS2 nanosheets can be reduced node resistor silver nanowire film and suppress silver nanowires oxidation in air condition. The preparation of glass can supply the power for a LED bulb, this provides a new way for photovoltaic building integration thinking.Conducting polymers are another promising new conductive material, for poly(3,4-ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS) conductive material, too much of PSS insulating material is a fatal problem for conductivity. The sulfonated carbon nanotubes(SCNT) act as the second polymerization templates for in situ preparation of PEDOT:PSS. It essentially reduce the content of insulating PSS, instead of pre- or post- solvent processing, for a highly conductive PEDOT:PSS:SCNT composite electrode. The PEDOT:PSS:SCNT was characterized with regard to theircomposition, conformation, stability, morphology, optoelectronic devices, and work function behavior. The PEDOT:PSS:SCNT films with low work function(4.4 eV) andremarkableoptoelectronic properties(over 3500 S cm-1, ~78% transmittance at a 70 nm thickness film) were faultlesslyintegrated as cathode in organic solar cells(OSCs) with a power conversion efficiency(PCE) of 9.91%. As for PEDOT:PSS conductive material solution processing, strong adhesion, easy to flexible machining characteristics, has become the primary research goals. In order to improve the PEDOT:PSS conductive material conductivity and related mechanical stability. Experimental study on preparation of highly dispersed functional carbon material(carbon nanotubes acidification and ethyl cellulose: graphene) areboth used to doping into PEDOT:PSS conductive material. Studies have shown that functional carbon material can be formed with the PEDOT interaction, changing PEDOT chains from the benzene structure to quinone structure, thereby improving the conductivity. During the roll to roll process for preparing a transparent electrode, gravure and slot extrusion coating processare mainlyfor preparingthe transparent electrode. By controlling the volume ratio of PEDOT:PSS composite ink and coating radio, thereby preparing an transparent electrode(~80%) with a sheet resistance of 15 ? sq-1. Study found that, the roll-to-roll process of post-treatmentcan act as a eluted role for PEDOT:PSS film in reducing the content of PSS further improved conductivity. After the introduction of functional carbon material, can effectively improve the moisture and mechanical stability of the transparent electrode, improving application and environmental stability of the electrode. Preparation of printing applications PEDOT:PSS transparent during the preparation of the electrode of the solar cell efficiency of nearly 10% of the photoelectric conversion efficiency.In addition, based on the research on new transparent electrode via roll-to-roll, trying a mixed solvent for the active layer with a photoelectric conversion efficiency of 0.6%(device area: 1 cm2)...