Enhancement of the intrinsic light harvesting capacity of Cs2AgBiBr6 double perovskite via modification with sulphide†,Journal of Materials Chemistry A

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Enhancement of the intrinsic light harvesting capacity of Cs2AgBiBr6 double perovskite via modification with sulphide†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-12-11 , DOI: 10.1039/c9ta10422d
Narendra Pai _{1,

2,

3,

4,

5} , Jianfeng Lu _{2,

3,

4,

5,

6} , Mingchao Wang _{2,

3,

4,

7} , Anthony S. R. Chesman _{3,

3,

4,

8,

9} , Aaron Seeber _{3,

4,

8} , Pavel V. Cherepanov _{1,

2,

3,

4} , Dimuthu C. Senevirathna _{1,

2,

3,

4} , Thomas R. Gengenbach _{3,

4,

9} , Nikhil V. Medhekar _{2,

3,

4,

7} , Philip C. Andrews _{1,

2,

3,

4} , Udo Bach _{2,

3,

4,

5,

6} , Alexandr N. Simonov _{1,

2,

3,

4,

10}

Affiliation

Caesium silver bismuth halide double perovskites, in the first instance Cs₂AgBiBr₆, were recently introduced to the field of emerging photovoltaics as environmentally friendly, non-toxic and thermodynamically stable photoabsorber materials. However, the wide indirect bandgaps of these materials indicate the need for bandgap engineering and enhancing the light absorption to improve the photovoltaic performance. The present work demonstrates that this can be achieved via modification of the double perovskite with sulphide to obtain caesium silver bismuth sulphobromide materials, Cs₂AgBiBr_6−2xS_x, which have been synthesised as pin-hole-free uniform films and systematically investigated herein. Notable enhancements in the intrinsic light absorption for 0 ≤ x ≤ 0.2 are demonstrated, as are the improvements by up to 50% in the photocurrent density of the corresponding thin-film solar cells. The devices based on the films with the nominal composition Cs₂AgBiBr_5.8S_0.1 delivered a short-circuit current density of 3.0 ± 0.3 mA cm⁻² and a power conversion efficiency of 1.9 ± 0.1% (cf. 2.1 ± 0.2 mA cm⁻² and 1.3 ± 0.1%, respectively, for the control cells based on the sulphide-free Cs₂AgBiBr₆). Equally important, caesium silver bismuth sulphobromides demonstrate excellent stability against all common environmental stimuli, viz. heat, light, and humidity.

中文翻译：

通过硫化物修饰增强Cs ₂ AgBiBr ₆双重钙钛矿的固有光收集能力†

铯银卤化铋复钙钛矿，首先是Cs ₂ AgBiBr ₆，最近作为环保，无毒和热力学稳定的光吸收剂材料被引入新兴的光伏领域。然而，这些材料的宽间接带隙表明需要带隙工程和增强光吸收以改善光伏性能。本工作表明，这可以通过用硫化物修饰双钙钛矿来获得，以获得硫化银铯铯铋铋材料Cs ₂ AgBiBr _{6-2 x} S _x，已合成为无针孔的均匀薄膜，并在此进行了系统研究。明显的改进在本征光吸收为0≤ X ≤0.2被证实的，因为是由高达50％，在相应的薄膜太阳能电池的光电流密度的改进。基于与所述标称组成的薄膜器件铯₂ AgBiBr _5.8 š _0.1递送的3.0±0.3毫安厘米的短路电流密度^-2和1.9±0.1％（功率转换效率比照2.1±0.2毫安厘米^-对于基于无硫化物的Cs ₂ AgBiBr ₆的对照电池，分别为²和1.3±0.1％）。同样重要的是，溴化铯银铋硫化物对所有常见的环境刺激表现出优异的稳定性。热量，光线和湿度。

更新日期：2020-01-07

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