High-Performance Low-Bandgap Polymer Solar Cells With Optical Microcavity Employing Ultrathin Ag Film Electrode

被引：2

作者：

Li, Ning ^{[1
]}

Chen, Dazheng ^{[1
]}

Zhang, Chunfu ^{[1
]}

Chang, Jingjing ^{[1
]}

Lin, Zhenhua ^{[1
]}

Han, Genquan ^{[1
]}

Zhang, Jincheng ^{[1
]}

Guo, Lixin ^{[1
]}

Hao, Yue ^{[1
]}

机构：

[1] Xidian Univ, Xian 710071, Peoples R China

来源：

IEEE PHOTONICS JOURNAL | 2016年 / 8卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Microcavity; ultrathin Ag film electrode; low-bandgap; polymer solar cells; PHOTOVOLTAIC DEVICES; LIGHT; EFFICIENT; ENHANCEMENT; ANODES; OXIDE; ARCHITECTURE; DESIGN; INDIUM;

D O I：

10.1109/JPHOT.2016.2616579

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In this paper, the performance of indium-tin-oxide (ITO) free microcavity polymer solar cells based on the thieno[3,4-b] thiophene/benzodithiophene:[6,6]-phenyl C-71-butyric acid methyl ester (PTB7: PC71BM) blend and transparent Ag electrode is systematically investigated by optical simulation. Here, the device has a structure of glass/opaque Ag/FPI-PEIE/PTB7: PC71BM/MoO3/ultrathin Ag/TeO2, where the fulleropyrrolidine ethoxylated polyethylenimine (FPI-PEIE) and MoO3 act as charge transport layers and optical spacers, and the TeO2 serves as a transmittance enhancement layer. Compared to ITO-based devices, the microcavity device shows an obviously increased optical electric field intensity for the incident light wavelength from 600 to 750 nm, which agrees well with the better light absorption and lower reflectivity at relatively long wavelength. Further, enhanced performance is obtained from an optimizing top-illuminated device. It is noted that a remarkably enhanced short-circuit current density of 19.50 mA/cm(2) is achieved for the microcavity device at optimized layer thicknesses, which is 11% higher than that of ITO-based devices. The improved performance of the microcavity device could be attributed to optically confined and reinforced incident light between two Ag reflective electrodes induced by the coherent interference, which boosts the light harvesting in the active layer, especially the long-wavelength incident photons. The results could provide a promising optical design for low-bandgap polymer solar cells.

引用

页数：12

共 46 条

[1] Remarkably High Conversion Efficiency of Inverted Bulk Heterojunction Solar Cells: From Ultrafast Laser Spectroscopy and Electron Microscopy to Device Fabrication and Optimization [J].