Optimization Of Interface Layer And Research Of Ternary And Semitransparent Organic Solar Cells Based On PCE-10 And PC₇₁BM System

Nowadays,with the rapid development of society and economy,energy consumption is becoming more and more serious,and the development of renewable new energy is imperative.The conversion of solar energy into electricity through photovoltaic technology is one of the important topics of current researches.In the past few decades,bulk heterojunction organic solar cells（BHJ-OSCs）have become an outstanding representative of solar cells and have attracted widespread attention due to their advantages in flexibility,low cost,light weight,solution processing,low temperature and other huge advantages.Although BHJ-OSCs have many advantages,when compared with silicon solar cells,the power conversion efficiency（PCE）of BHJ-OSCs is still lower than silicon solar cells,so how to improve the performance of BHJ-OSCs is still a huge challenge.A large number of experimental and theoretical researches on BHJ-OSCs have been carried out all over the world,and great progress has been made.By optimizing the device interface layer,designing and synthesizing new structure active layer materials,proposing ternary active layer strategies,and preparing stacked devices and other methods,which have promoted the rapid development of BHJ-OSCs.In the development of BHJ-OSCs,in the aspect of experimental researches,it is also important to understand the working mechanism of BHJ-OSCs,and to design and optimize the device performance by using the working mechanism.In terms of practical application,how to design semitransparent organic solar cells that guarantee both high light transmission and high photoelectric performance is also one of the hot issues in current researches.Therefore,based on the PCE-10:PC₇₁BM system,this thesis mainly focuses on the modification of binary BHJ-OSCs by using the interface layer,and research the performance of ternary and semitransparent organic solar cell.The details are as follows:1.A new method for the preparation of Cu O thin films by solution oxidation is demonstrated.The film prepared by this method has high light transmission and high work function.As the hole transport layer,it can be well matched and applied to BHJ-OSCs.The PCE of Cu O-based BHJ-OSCs prepared by this method can reach8.45%,which is very close to the traditional PEDOT:PSS-based BHJ-OSCs.2.Ternary BHJ-OSCs were prepared with PCE-10 as donor and BT-CIC、PC₇₁BM as acceptors.Experimental results show that adjusting the ratios and contents of BT-CIC and PC₇₁BM can effectively control the open circuit voltage and short circuit current of the devices.When PCE-10:BT-CIC:PC₇₁BM=1:1:1,the devices achieved a PCE of 10.44%.Through binary BHJ-OSCs parallel experiments and the proportion regulation of receptor components experiments,we confirmed that the working mechanism of the ternary BHJ-OSCs is the parallel structure.3.Binary and ternary semitransparent organic solar cells were prepared using the materials and optimized conditions in section 2.When the thickness of the Ag electrode is 30 nm,the binary semitransparent organic solar cell can obtain a PCE of6.61%while maintaining an average light transmittance of 21.60%in the visible light region;the ternary semitransparent organic solar cell can obtain a PCE of 7.41%while maintaining an average light transmittance of 30.30%in the visible light region.