| Organic solar cells are one of the best ways to use solar energy reasonably and efficiently in the future owing to their advantages of low cost,light weight and flexibility etc.The interface modification layer can effectively improve the photovoltaic conversion efficiency of organic solar cells.In this thesis,p-CPE-1,p-CPE-2 and p-CPE-3 conjugated polyelectrolytes that composed ofπ-πconjugated main chain and ionic side chain were designed and synthesized.The dipolarization between ion side chain and main chain is regulated by proton acid doping,which effect improving the self-doping of conjugate polyelectrolyte.Camphorsulfonic acid and hydrochloric acid were used as the protonic acid.By controlling the concentration of protonic acid and the doping time,the effects of doping on the photoelectric properties of p-CPE-1,p-CPE-2,and p-CPE-3 conjugated polyelectrolytes and the photovoltaic conversion efficiency of organic solar energy were discussed.This thesis is mainly divided into the following sections.1.2,7-Dibromocarbazole and 1,4-butanesulfonic acid sodium lactone were used to prepare intermediate product A through coupling reaction.Sodium4-（2-methyl-7-（7-methylbenzo[c][1,2,5]thiadiazol-4-yl）-9H-carbazol-9-yl）butane-1-sulfonate（abbreviation p-cpe-1）was synthesized from intermediate A and 4,7-bis（4,4,5,5-tetramethyl-1,3,2-dioxy heteropentroborane 2-group）-2,1,3-benzothiadiazole by Suzuki coupling reaction mechanism.Camphorsulfonic acid solution was used to dope-modify p-CPE-1.By adjusting the mass concentration of camphorsulfonic acid,the work function and conductivity of p-CPE-1 were improved.Compared with p-cpe-1(the work function was 5.02 eV,and the conductivity was 0.36×10-5S/cm),camphorsulfonic acid-doped p-CPE-1 work function was increased to 5.23 eV and the conductivity was increased to 1.67×10-5S/cm.p-CPE-1,camphorsulfonic acid-doped p-CPE-1 and PEDOT:PSS were used as the anode interface layer to prepare PM6:Y6organic solar cell device.The camphorsulfonic acid-doped p-CPE-1 obtained 11.87%photovoltaic conversion efficiency,which was 4.14%higher than the p-CPE-1 device efficiency（7.73%）.2.sodium 4-（2-methyl-7-（p-tolyl）-9H-carbazol-9-yl）butane-1-sulfonate is synthesized by coupling reaction between 1,4-benzene dipinacol ester and intermediate product A,referred to as p-CPE-2.Hydrochloric acid is used as the dopant.By adjusting the molar concentration and doping time of hydrochloric acid,p-CPE-2 is doped and modified.p-CPE-2 was doped with 0.5 mol/L hydrochloric acid for 40 min,referred to as PCB-ph-54.The photovoltaic conversion efficiency of organic solar cell devices with p-CPE-2 and PCB-ph-54 as the anode interface layer is5.79%and 10.75%,respectively.The work function of p-CPE-2 was 5.27 eV and the conductivity was 7.16×10-4S/cm,but the work function of PCB-ph-54 was increased to 5.42 eV and the conductivity to 9.13×10-4S/cm.The photoelectricity performance of p-CPE-2 modified by hydrochloric acid has been significantly improved,and the photovoltaic conversion efficiency of organic solar cells has been effectively improved,which is nearly 5%higher than that of p-CPE-2 devices.3.Suzuki coupling reaction between 2,5-thiophene diboronic acid and intermediate product A to obtain sodium 4-（2-methyl-7-（5-methylthiophen-2-yl）-9H-carbazol-9-yl）butane-1-sulfonate,abbreviated as p-CPE-3.p-CPE-3 doped with0.3 mol/L hydrochloric acid for 30 min,referred to as PCB-T-33.Compared to the undoped p-CPE-3 work function（4.84 eV）and conductivity(7.89×10-4S/cm),the work function of PCB-T-33 is improved by 0.39 eV,and the conductivity is increased by nearly 1.2 times.The photovoltaic conversion efficiency of organic solar cells with PBDB-TF:IT4F as the active layer and p-CPE-3 and PCB-T-33 as the anode interface layer were 5.36%and 13.36%respectively.PCB-T-33 has the appropriate work function and conductivity,so the optimal photovoltaic performance is obtained.The photovoltaic performance of organic solar cells can be effectively improved by proton acid doping. |
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