Luminescent europium-doped titania for efficiency and UV-stability enhancement of planar perovskite solar cells

被引：67

作者：

Chen, Peng ^{[1
]}

Wang, Zhiliang ^{[1
]}

Wang, Songcan ^{[1
]}

Lyu, Miaoqiang ^{[1
]}

Hao, Mengmeng ^{[1
]}

Ghasemi, Mehri ^{[1
]}

Xiao, Mu ^{[1
]}

Yun, Jung-Ho ^{[1
]}

Bai, Yang ^{[1
]}

Wang, Lianzhou ^{[1
]}

机构：

[1] Univ Queensland, Nanomat Ctr, Sch Chem Engn, Australian Inst Bioengn & Nanotechnol, Brisbane, Qld 4072, Australia

来源：

NANO ENERGY | 2020年 / 69卷

基金：

澳大利亚研究理事会;

关键词：

Down-shifting; Europium-doped titanium dioxide; UV stability; Band alignment; Planar perovskite solar cells; HIGHLY EFFICIENT; PHOTOCATALYTIC ACTIVITY; HALIDE PEROVSKITES; TIO2; DEGRADATION; PERFORMANCE; FILMS; EU; ANATASE; LAYERS;

D O I：

10.1016/j.nanoen.2019.104392

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Perovskite solar cells (PSCs) have demonstrated high power conversion efficiencies (PCEs) but poor stability against ultraviolet (UV) irradiation. Here, we report a one-pot synthesized luminescent europium-doped titania (Eu-TiO2) via chemical-bath deposition at low-temperature (70 degrees C) for planar PSCs, which enables simultaneous efficiency and UV-stability enhancement. We show that the Eu-TiO2 could effectively convert damaging UV photons into useful visible luminescence for additional light harvesting. A more optimal energy band alignment at the Eu-TiO2/perovskite interface leads to facilitated charge extraction and suppressed non-radiative recombination. The use of Eu-TiO2 in PSCs results in increased photocurrent and open-circuit voltage, yielding an enhanced PCE of 21.40% with relative to pristine TiO2 device (19.22%). More importantly, the Eu-TiO2 devices exhibit remarkably improved UV stability, retaining 75% of the initial PCE after exposing to UV illumination for 500 h, while the devices with pristine TiO2 lost the majority of their original PCEs in 150 h. As a proof-of-concept, we further demonstrate the scalability of our method by fabricating a large-area Eu-TiO2 film of 64 cm(2) showing excellent uniformity.

引用

页数：9

共 68 条

[11] Effects of down-conversion CeO2:Eu3+ nanophosphors in perovskite solar cells [J].