文章信息/Info

Title:

9,9′�睟ifluorenylidene Derivatives for Organic Photovoltaic Cells

作者:

趙玉玲1; 李艷梅2; 劉瀟瀟3; 俞天智2

（1.蘭州交通大學(xué)化學(xué)與生物工程學(xué)院, 甘肅 蘭州 730070）（2.蘭州交通大學(xué) 光電技術(shù)與智能控制教育部重點實驗室, 甘肅 蘭州 730070）（3.蘭州交通大學(xué)機電學(xué)院，甘肅 蘭州 730070）

Author(s):

ZHAO Yuling1;  LI Yanmei2;  LIU Xiaoxiao3;  YU Tianzhi2

(1. School of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China) （2. Key Laboratory of Opto�睧lectronic Technology and Intelligent Control (Ministry of Education), Lanzhou Jiaotong University, Lanzhou 730070, China）（3. School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)

關(guān)鍵詞:

芴; 9; 9′�猜�(lián)芴烯; 有機小分子受體材料; 有機光伏材料; 有機光伏電池

Keywords:

fluorene;  9; 9′�瞓ifluorenylidene;  organic small-molecular acceptor;  organic photovoltaic materials;  organic photovoltaic cells

分類號:

TM914.4；TB34

DOI:

10.7502/j.issn.1674-3962.201902003

文獻標志碼:

A

摘要:

由于具有獨特的14π電子芳香結(jié)構(gòu)和扭曲的非平面構(gòu)型，9,9′�猜�(lián)芴烯衍生物成為近年來被廣泛研究的一類新型有機光伏材料。9,9′�猜�(lián)芴烯衍生物含有兩個剛性平面內(nèi)的聯(lián)苯單元，因此具有良好的熱穩(wěn)定性和化學(xué)穩(wěn)定性；且其具有優(yōu)良的光電特性，很容易接受電子，從而提升自身的最低未占分子軌道（LUMO）能級，使得其有機光伏器件的開路電壓增大。此外，9,9′�猜�(lián)芴烯有12個不同的取代位，與富勒烯衍生物相比，其結(jié)構(gòu)更具靈活性。但是，該類化合物的電子遷移率較低，使得其光伏電池的光電轉(zhuǎn)化效率過低。如何通過提高該類材料的電子遷移率、拓展其光譜吸收范圍和吸收強度來提高光伏器件的光電轉(zhuǎn)換效率，受到越來越多的關(guān)注和研究。闡述了近年來聯(lián)芴烯衍生物在有機光伏電池中的研究進展，并對其結(jié)構(gòu)、性能進行了簡要的分析。最后，對聯(lián)芴烯類材料的發(fā)展前景進行了展望。

Abstract:

As a new type of organic photovoltaic materials, 9,9′-bifluorenylidene (9,9′-BF) derivatives have attracted much scientific attention due to the aromaticity and twisted structure of the 9,9′-bifluorenylidene core. 9,9′-Bifluorenylidene derivatives contain two rigid coplane biphenyl units which can lead to good thermal and chemical stability of compounds, moreover, they have excellent photoelectric properties. These compounds could easily accept one electron to form 14-π-electron system, and thus they have aromaticity and improve the LUMO energy level of materials for increasing the open circuit voltage in organic photovoltaic (OPV) cells. In addition, 9,9′-bifluorenylidene has 12 different substitution positions, they can be easily replaced by suitable groups to systhesize the needed molecules, and its structure is more flexible than fullerene derivatives. However, the bulk heterojunction organic photovoltaic cells based on the reported 9,9′-bifluorenylidene derivatives have lower power conversion efficiency (PCE) because of their lower electron mobility. The key issues for improving their electron mobility and spectral absorption in the UV-vis region have been attractive. In this paper, we review the recent advances on 9,9′-bifluorenylidene derivatives as organic optoelectronic functional materials in organic photovoltaic cells, and the performance of these materials is analyzed from the view of molecular structures. Finally, the prospect of the development of bifluorene-based materials is addressed.