Quantum cutting in Pr
3+
-Yb
3+
codoped chalcohalide
glasses for high-efficiency c-Si solar cells
Yin-Sheng Xu,
1
Fei Huang,
1,2
Bo Fan,
3
Chang-Gui Lin,
1
Shi-Xun Dai,
1,
* Li-Yan Chen,
1,2
Qiu-Hua Nie,
1,2
Hong-Li Ma,
3
and Xiang-Hua Zhang
3
1
Laboratory of Infrared Materials and Devices, The Advanced Technology Research Institute,
Ningbo University, Ningbo 315211, China
2
College of Information Science and Engineering, Ningbo University, Ningbo 315211, China
3
Laboratoire des Verres et Céramiques, UMR-CNRS 6226, Sciences Chimiques de Rennes,
Université de Rennes 1, Rennes 35042, France
*Corresponding author: daishixun@nbu.edu.cn
Received February 4, 2014; accepted March 3, 2014;
posted March 10, 2014 (Doc. ID 204077); published April 3, 2014
Downconversion materials, which can convert one high-energy photon to two low-energy photons, have provided a
promising avenue for the enhancement of solar cell efficiency. In this work, the Pr
3
-Yb
3
codoped
25GeS
2
-35Ga
2
S
3
-40CsCl chalcohalide glasses were synthesized in a vacuumed silica ampoule by the melting–
quenching technique. Under 474 nm excitation, the visible and near-IR emission spectra reveal the energy transfer
from Pr
3
to Yb
3
ions, resulting in the intense 1008 nm near-IR emission for the c-Si solar cells. By tuning the
excitation laser power, it is determined that one visible photon has been cut into two near-IR photons during
the energy transfer process. With the help of an integrated sphere, the real quantum yields of near-IR emissions
were calculated. For the 0.2Pr
2
S
3
-0.2Yb
2
S
3
(in mol.%) codoped chalcohalide glass, the quantum yield equals
10.8%. Although this efficiency is still low, this result will open a new route to realize the efficient spectral modi-
fication of the solar spectrum. © 2014 Optical Society of America
OCIS codes: (160.5690) Rare-earth-doped materials; (250.5230) Photoluminescence; (260.2160) Energy transfer.
http://dx.doi.org/10.1364/OL.39.002225
Spectral conversion materials have provided a promising
avenue for the enhancement of solar cell efficiency [
1,2].
Until now, the most studied conversion material focused
on down-con version (DC) materials [
3]. Although the up-
conversion (UC) process is especially useful for solar
cells with a large bandgap where transmission losses
dominate, UC is a nonlinear process and needs strong
light power densities and low theory conversion efficien-
cies. Co nversely, DC is a linear process which makes it
possible to obtain high conversion efficiencies indepen-
dent of the incident power and allows for the use noncon-
centrated sunlight [
4]. As shown in Fig. 1, the spectral
response of a c-Si solar cell has very low efficiency when
the light is less than 500 nm. By using the DC layer, one
higher energy photon can split to two NIR photons. Each
of these photons can subsequently be absorbed by the
solar cell and generate an electron–hole pair. It is most
beneficial for solar cells with a smaller bandgap, where
thermalization losses are the major loss factor. DC of
UV or visible photons into NIR photons was first demon-
strated in Y; YbPO
4
:Tb
3
phosphor [5]. Through a
cooperative energy transfer process, the energy trans-
ferred from Tb
3
to Yb
3
and emitted emission around
1000 nm, which is just above the bandgap of crystalline
silicon. More recently, DC has also been reported in
several lanthanide couples, viz., Pr
3
-Yb
3
[6–10],
Tm
3
-Yb
3
[11], Tb
3
-Yb
3
[12], Nd
3
-Yb
3
[4,13],
Ho
3
-Yb
3
[14], Er
3
-Yb
3
[15], and so on [16,17]. Essen-
tially, the Yb
3
ions are the main active ions for its simple
two levels (
2
F
5∕2
→
2
F
7∕2
) and the emission just suitable
for the c-Si solar cell. Based on Judd–Ofelt calculations,
the quantum efficiency (QE) of the desired NIR emission
can be very high, up to nearly 200%. However, the real
quantum yield (QY), defined as η is very low due to
the presence of impurities or the low energy transfer
efficiency. In our previous work, the η of NIR emission
in Pr
3
-Yb
3
-doped oxyfluoride glass is only 12% [7].
Until now, the reported maximum η of NIR emission
(<1200 nm) was 51% which was demonstrated in the
GeS
2
-Ga
2
S
3
-CsCl chalcogenide glass doped with Er
3
and Yb
3
[15]. Chalcogenide glass, which is famous for
its excellent IR transparency and high linear refractive
index and nonlinear coefficient, has very low phonon
energy (<350 cm
-1
) that can suppress the nonradiated
emission resulting from multiphonon relaxatio n (MPR).
Therefore, it is important to investigate the DC in chalco-
halide glass to find more efficient spectral modification
materials for c-Si solar cells.
In this Letter, near-IR DC in GeS
2
-Ga
2
S
3
-CsCl glass
codoped with Pr
3
-Yb
3
ions is studied. The (Pr, Yb) pair
is chosen because the transitions between the depopula-
tion of the Pr
3
:
3
P
0
excited state can occur through
two sequential energy transfer steps between Pr
3
and
Yb
3
ions with Pr
3
:
1
G
4
acting as the intermediate level,
Fig. 1. AM1.5G spectrum showing (a) the response curve of
c-Si solar cells, (b) a typical excitation spectrum at 980 nm,
and (c) the emission spectrum under 474 nm excitation for
Pr
3
-Yb
3
ions.
April 15, 2014 / Vol. 39, No. 8 / OPTICS LETTERS 2225
0146-9592/14/082225-04$15.00/0 © 2014 Optical Society of America
下载后可阅读完整内容，剩余3页未读，立即下载
weixin_38657139
- 粉丝: 9
- 资源: 955
我的内容管理
展开
最新资源
- JDK 17 Linux版本压缩包解压与安装指南
- C++/Qt飞行模拟器教员控制台系统源码发布
- TensorFlow深度学习实践：CNN在MNIST数据集上的应用
- 鸿蒙驱动HCIA资料整理-培训教材与开发者指南
- 凯撒Java版SaaS OA协同办公软件v2.0特性解析
- AutoCAD二次开发中文指南下载 - C#编程深入解析
- C语言冒泡排序算法实现详解
- Pointofix截屏：轻松实现高效截图体验
- Matlab实现SVM数据分类与预测教程
- 基于JSP+SQL的网站流量统计管理系统设计与实现
- C语言实现删除字符中重复项的方法与技巧
- e-sqlcipher.dll动态链接库的作用与应用
- 浙江工业大学自考网站开发与继续教育官网模板设计
- STM32 103C8T6 OLED 显示程序实现指南
- 高效压缩技术：删除重复字符压缩包
- JSP+SQL智能交通管理系统：违章处理与交通效率提升
资源上传下载、课程学习等过程中有任何疑问或建议，欢迎提出宝贵意见哦~我们会及时处理！
点击此处反馈
