The influence of sequential ligand exchange and elimination on the performance of P3HT:CdSe quantum dot hybrid solar cells

被引：11
作者：
Lee, Donggu [1 ]
Lim, Jaehoon [1 ,2 ]
Park, Myeongjin [1 ]
Kim, Jun Young [1 ]
Song, Jiyun [1 ]
Kwak, Jeonghun [3 ]
Lee, Seonghoon [4 ]
Char, Kookheon [5 ]
Lee, Changhee [1 ]
机构：
[1] Seoul Natl Univ, Interuniv Semicond Res Ctr, Dept Elect & Comp Engn, Seoul 08826, South Korea
[2] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA
[3] Univ Seoul, Sch Elect & Comp Engn, Seoul 02504, South Korea
[4] Seoul Natl Univ, Dept Chem, Seoul 08826, South Korea
[5] Seoul Natl Univ, Sch Chem & Biol Engn, WCU Program Chem Convergence Energy & Environm, Natl Creat Res Initiat Ctr Intelligent Hybrids, Seoul 08826, South Korea
来源：
NANOTECHNOLOGY | 2015年 / 26卷 / 46期
基金：
新加坡国家研究基金会;
关键词：
polymer-QD hybrid solar cells; ligand exchange and elimination; CdSe quantum dots (QDs); poly(3-hexylthiophene) (P3HT); CDSE NANOCRYSTALS; EQUIVALENT-CIRCUIT; CONJUGATED POLYMER; SURFACE TRAPS; EFFICIENCY; RECOMBINATION; NANOPARTICLES; NANORODS; AMINE; SIZE;
D O I：
10.1088/0957-4484/26/46/465401
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We report on a sequential ligand exchange and elimination process for the fast and easy surface modification of CdSe quantum dots (QDs) in order to improve the electronic interaction between poly(3-hexylthiophene) (P3HT) and CdSe QDs in P3HT: CdSe hybrid solar cells. We systematically investigated the influence of surface treatment on the insulating ligand shell of CdSe QDs using H-1-NMR analysis, and correlated their influence on the photovoltaic properties of P3HT: CdSe hybrid solar cells. A decrease in the average thickness of the ligand shells directly improved carrier transport properties. Moreover, the presence of remnant 1-hexylamine ligands provided efficient surface trap passivation. As a result, overall solar cell performance (especially fill factor and power conversion efficiency) was enhanced and the recombination mechanism was dominated by monomolecular recombination due to enhanced carrier collection length (l(C0)).
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页数：9
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