(1. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083)
摘 要: 通過(guò)Stille偶聯(lián)聚合方法合成一種新型的Pechmann類窄帶隙聚合物 (PBDTTP)，并將其應(yīng)用到太陽(yáng)能電池的研究中。PBDTTP具有高的相對(duì)分子質(zhì)量、良好的溶解性能與成膜性能。紫外-可見(jiàn)吸收光譜表明，在薄膜狀態(tài)下，PBDTTP的吸收范圍在300~900 nm 之間，其最大吸收峰位置在748 nm，相應(yīng)的光學(xué)帶隙為1.37 eV。光伏器件的結(jié)構(gòu)為(ITO)/PEDOT:PSS/PBDTTP:PC71BM/Al，初步的器件結(jié)果顯示，當(dāng)PBDTTP與PC71BM質(zhì)量比為1:2時(shí)，光伏器件具有最高的能量轉(zhuǎn)換效率(PCE)，為1.03%，對(duì)應(yīng)的開(kāi)路電壓(Voc)為0.75 V，短路電流密度(Jsc)為2.24 mA/cm2，填充因子(FF)為61.2%。
關(guān)鍵字: 窄帶隙；Pechmann類聚合物；合成；光伏應(yīng)用
（1. State key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:A new low bandgap Pechmann-based polymer (PBDTTP) was synthesized, and this is the first time to make Pechmann-based polymer for photovoltaic applications. PBDTTP was found to be soluble in common organic solvents, with excellent film forming properties. The gel permeation chromatography (GPC) shows that the polymer has relatively high relative molecular mass. The polymer film exhibits broad absorption band in the wavelength region from 300 to 900 nm with an optical bandgap of 1.37 eV. Preliminary photovoltaic cells based on the composite structure of ITO/PEDOT:PSS/PBDTTP:PC71BM/Al show an open-circuit voltage Voc of 0.75 V, a power conversion efficiency (PCE) of 1.03%, a short circuit current density (Jsc) of 2.24 mA/cm2 and a fill factor of 61.2%.
Key words: low bandgap; Pechmann-based copolymer; synthesis; photovoltaic application
