Polymer Optoelectronic Devices Based On Solution-Processed Active Layer And Anode Interlayer

Organic photovoltaics(OPVs) have received much attention because of theiradvantanges of easy processing, low-cost, light weight and flexibility. Recently, powerconversion efficiency(PCE) more than 10% for OPV has been realized, which is a significantmilestone on the way towards commercial production. Noteworthily, we still have a long wayto bring OPVs to our daily life and produce. Organic light-emitting diode(OLED)-baseddisplay panels are also fabricated from organic semiconductor. OLEDs have shown manymerits, such as fast response, wide view angle, high brightness, ultrathin, flexible, low powerconsumption, and so on. Consequently, OLEDs have drawn much attention of scientists.Although OLED products have already appeared, most of them are of small size. Theproduction yields for large size products are still not high enough, which affect the marketshare in a large extent. Besides, the realization of stable, highly efficient blue-emitting OLEDis a vital issue that influences the popularization. This paper provides three researchs aboutOPV and PLED(polymer light-emitting diode).First of all, we studied the photophysical property, hole mobility of two BDT-TT-basedconjugated polymers. The device structure of ITO/PFN/Polymer:PC71BM/Mo O3/Al wasadopted. Moreover, characterizations like SCLC, AFM and EQE were carried out forsolutions, pristine films, bulk heterojunction(BHJ) films and OPV devices. The data of allthese tests and performances of OPV devices indicated that the length of alkyl side-chainsplays an important role on optoelectronics property. In order to achieve a high efficiency, it isimportant to adopt appropriate device structure. Utilization of DIO(1,8-diiodooctane)significantly affected the morphology of BHJ film and the resulting performances of OPVdevices.Secondly, we carried out a systematic study to research the optoelectrical property offluorinated TPS-containing conjugated polymer PFCFS1, PFCFS5, PFCFS10, PFCFS20,including photophysical property(UV-vis, PL, PLQY) and electroluminescent devicesperformance. Three kinds of device structures were adopted as below:A:ITO/PEDOT:PSS/PFCFS/Cs F/Al, B: ITO/PEDOT:PSS/PFCFS/TPBI/Cs F/Al, C:ITO/PEDOT:PSS/PFCFS:(20 %wt) PBD/TPBI/Cs F/ Al. The highest electroluminescentefficiency were realized when TPBI was introduced in structure B. When compared theperformances before and after utilization of TPBI and PBD in structure A, B and C,respectively, we concluded that it’s significant to keep carriers transport balance and optimizeexciton recombination area.Finally, we launched UV-vis transmittance, work function, atomic force microscope teststo characterize Mo O3 films and PEDOT:PSS films. Notably, Mo O3 films were prepared froma simple and low-cost solution deposition. Devices structures includedITO/Mo O3/PTB7:PC71BM/PFN/Al and ITO/Mo O3/P-PPV/Cs F/Al, in which Mo O3 andPEDOT:PSS films were integrated as anode interlayer, respectively. The test results showedthat the performance of OPV and PLED based on Mo O3 were little poorer than the normaldevices of PEDOT:PSS. If considering the preparation and cost advantages, it may beexpected that the Mo O3 preparation method would be an efficient candidate to contribute tothe commercialization of related optoelectronic devices.