Naphtho[1,2-c: 5,6-c']bis[1,2,5] thiadiazole-based conjugated polymers consisting of oligothiophenes for efficient polymer solar cells
Naphtho[1,2-c: 5,6-c']bis[1,2,5] thiadiazole-based conjugated polymers consisting of oligothiophenes for efficient polymer solar cells
复制标题
DOI：
10.1016/j.polymer.2017.06.023
复制
发表时间：
2017
期刊：
影响因子：
4.6
通讯作者：
Xia Yangjun
中科院分区：
文献类型：
--
作者：
Tong Junfeng;Li Jianfeng;Zhang Peng;Ma Xuying;Wang Min;An Lili;Sun Jingbiao;Guo Pengzhi;Yang Chunyan;Xia Yangjun
两种给体-受体（D-p-A）型低带隙（LBG）共轭聚合物，即PT-DTNT-DT和。PTT-DTNT-DT，由噻吩(T)和/或噻吩[3,2-b]噻吩（TT）作为供体部分组成，二。两侧的2-十二烷基十四烷基噻吩基为p-桥，平面度大，吸电子力强。以萘[1,2-c:5,6-c0]和[1,2,5]噻二唑（NT）为受体进行了系统的研究。两种共聚物在300e850nm范围内均表现出较强的吸收。具有低洼最高的已占据分子轨道（HOMO）能级，约为5.38 eV；与PC71BM相匹配的最低未占据分子轨道（LUMO）能级为3.90 eV。比较。以2,20-二噻吩（2T）为连接体的纳米基星材料PNTz4T， HOMO能级为。所得两种聚合物的吸收光谱范围均有显著降低。通过将2T替换为T和TT明显拓宽。PTT-DTNT-DT共平面性较好。在氯苯中有明显的聚集倾向，空间电荷限制的空穴迁移率较高。电流（SCLC）模型比pt - dnt - dt模型要好。倒置体异质结聚合物太阳能电池。（PSCs），分别以这些nt基共聚物为电子给体，PC71BM为电子给体。受体被制造。优化后的PT-DTNT-DT电池具有较高的功率转换效率。（PCE）为5.10%，开路电压（VOC）为0.76 V，具有良好的短路电流（JSC）。为11.24 mA cm2，填充因子（FF）为59.88%，而基于PTT-DTNT-DT的器件显示。PCE相对较高，为6.88%，略高于PNTz4T(6.72%)，且有所增加。在相同条件下，JSC为14.74 mA cm2， FF为64.00%，但VOC略有下降，为0.73 V。实验条件。因此，这些结果表明低聚噻吩- nt基共聚物。都是有望实现高效psc的候选者。
Two donor-p-acceptor (D-p-A) type low bandgap (LBG) conjugated polymers, namely, PT-DTNT-DT and.PTT-DTNT-DT, consisting of thiophene (T) and/or thieno[3,2-b]thiophene (TT) as donor moiety, two.flanking 2-decyltetradecylthienyl as p-bridges and large planarity and strong electron-withdrawing.naphtho[1,2-c:5,6-c0]bis[1,2,5]thiadiazole (NT) as acceptor moiety have been developed and systematically.investigated. Both copolymers exhibited strong absorption in the range of 300e850 nm, whilst.possessed the low-lying highest occupied molecular orbital (HOMO) energy level of ca. 5.38 eV and the.matched lowest unoccupied molecular orbital (LUMO) energy level of 3.90 eV with PC71BM. Compared.with NT-based star material PNTz4T using 2,20-bithiophene (2T) as the linker, the HOMO energy level of.the resultant two polymers have been significantly lowered while the absorption spectra range were.obviously broadened by replacing of 2T with T and TT. PTT-DTNT-DT showed better coplanarity, more.pronounced aggregation tendency in chlorobenzene and higher hole mobility of space-charge-limited.current (SCLC) model than those of PT-DTNT-DT. Inverted bulk heterojunction polymer solar cells.(PSCs), with these NT-based copolymers as electron donors, respectively, and PC71BM as electron.acceptor were fabricated. The optimized cell based on PT-DTNT-DT exhibited the power conversion efficiency.(PCE) of 5.10%, with an open-circuit voltage (VOC) of 0.76 V, promising short-circuit current (JSC).of 11.24 mA cm2 and fill factor (FF) of 59.88%, whereas, the device based on PTT-DTNT-DT showed.relatively higher PCE of 6.88% which was slightly higher than that of PNTz4T (6.72%), with an increased.JSC of 14.74 mA cm2 and FF of 64.00%, despite the slightly decreased VOC of 0.73 V, under the same.experimental conditions. Therefore, these results indicated the oligothiophene-NT based copolymers.were promising candidates aimed at achieving efficient PSCs.