文章信息/Info

Title:

The Performance of Organic Solar Cell with New Polymer Donor

作者:

彭清;  雷鋼鐵;  劉煜;  朱衛國

環境友好化學與應用教育部重點實驗室，湘潭大學化學學院，湘潭，湖南，411105

Author(s):

PENG Qing;  LEI Gangtie;  LIU Yu;  ZHU Weiguo

Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China

關鍵詞:

有機太陽能電池; 聚合物給體; 受體; 添加劑

DOI:

10.7502/j.issn.1674-3962.2015.02.08

文獻標志碼:

A

摘要:

設計合成了新型聚合物給體材料PTT-FTQ，以PTT-FTQ:PCBM體系作為活性層，研究了給受體比例及膜厚、受體類型、添加劑等因素對有機太陽能電池性能的影響。結果表明，當給受體比例為1:2時，PTT-FTQ能與受體PC61BM形成良好的網絡結構，活性層薄膜表面變得更加光滑平整，在活性層膜厚為120 nm時，有利于吸收光子，傳輸激子，器件能量轉化效率達到2.12%，采用1,8-二碘辛烷(DIO)做添加劑，在添加量為溶劑的1%時，效率提升到2.18%，隨著DIO加入量的增加，反而會減少給受體間的界面接觸面積，導致激子的解離效率和載流子的傳輸效率大幅度降低。而采用PC71BM做受體時，電池的短路電流密度比PC61BM體系下的要大得多，但是開路電壓會稍低，這主要是PC71BM有較強的光譜吸收但LUMO能級較低，PTT-FTQ:PC71BM體系能量轉化效率達到2.78%。

Abstract:

A new donor material PTT-FTQ for organic solar cell (OSC) was synthesized and investigated. With the PTT-FTQ: PCBM as active layer, the factors which influenced the performance of OSC such as the ratio of donor/acceptor, the film thickness of active layer, the various acceptors and the additive were studied and optimized. The results showed that when the ratio of donor/acceptor was 1:2, a better interpenetrating network between PTT-FTQ and PC61BM was formed and the active layer has a more smooth surface morphology. When the film thickness of active layer was 120 nm, the power conversion efficiency (PCE) of OSC was 2.12%. Using 1, 8-diiodooctane (DIO) as the additive, PCE of OSC was 2.18%. The current density of OSC with PC71BM as acceptor is much greater than that of PC61BM while the voltage is slightly lower. This is mainly due to PC71BM has lower LUMO energy level and stronger spectral absorption. High PCE of 2.78% was achieved with PC71BM as acceptor.