Efficiency enhancement of inverted polymer solar cells by doping NaYF sub(4):Yb super(3+), Er super(3+) nanocomposites in PCDTBT:PCBM active layer

NaYF sub(4):Yb super(3+), Er super(3+) nanocomposites (NCs) are synthesized by a facile solvothermal approach and doped into PCDTBTiPCBM blend as a bifunctional additive to improve peformance of inverted polymer bulk heterojunction (BHJ) solar cells. The dependence of device performance on NaYF sub(...

Full description

Saved in:
Bibliographic Details
Published in:Solar energy materials and solar cells 2014-05, Vol.124, p.126-132
Main Authors: Guo, Wenbin, Zheng, Kezhi, Xie, Wenfa, Sun, Lu, Shen, Liang, Liu, Chunyu, He, Yeyuan, Zhang, Zhihui
Format: Article
Language:English
Subjects:
Blends
Current density
Doping
Light absorption
Nanocomposites
Photovoltaic cells
Scattering
Solar cells
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:NaYF sub(4):Yb super(3+), Er super(3+) nanocomposites (NCs) are synthesized by a facile solvothermal approach and doped into PCDTBTiPCBM blend as a bifunctional additive to improve peformance of inverted polymer bulk heterojunction (BHJ) solar cells. The dependence of device performance on NaYF sub(4):Yb super(3+), Er super(3+) NCs in the blend film is investigated. The results show that the short-circuit current density is apparently enhanced by doping NaYF sub(4):Yb super(3+), Er super(3+) NCs into the active layer while maintaining the open-circuit voltage and fill factor, leading to an increase in power conversion efficiency. NaYF sub(4):Yb super(3+), Er super(3+) NCs acts two kinds of roles for light absorption enhancement. Up-conversion (UC) emission from Yb super(3+) sensitized Er super(3+) dopants in the NaYF sub(4):Yb super(3+), Er super(3+) NCs is observed. The photocurrent generated from UC near 980 nm excitation can improve the utilization of solar photons in the near infrared (NIR). The scattering effect of NaYF sub(4) nanoparticles (NPs) enhances the light absorption in visible region. The performance of polymer solar cell doped with NaYF sub(4):Yb super(3+), Er super(3+) NCs is compared with that of undoped. The concept of integrating UC and scattering functionality into active layer suggests a promising and practical pathway for improving visible and NIR absorption of polymer solar cells.
ISSN:0927-0248
DOI:10.1016/j.solmat.2014.01.038