Strategic Design of Three-Dimensional (3D) Urchin-Like Pt鈥揘i Nanoalloys: How This Unique Nanostructure Boosts the Bulk Heterojunction Polymer Solar Cells Efficiency to 8.48%

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• 作者：Shang-Wei Chou ; Hsieh-Chih Chen ; Zhiyun Zhang ; Wei-Hsuan Tseng ; Chih-I Wu ; Ya-Yun Yang ; Ching-Yen Lin ; Pi-Tai Chou
• 刊名：Chemistry of Materials
• 出版年：2014
• 出版时间：December 23, 2014
• 年：2014
• 卷：26
• 期：24
• 页码：7029-7038
• 全文大小：713K
• ISSN：1520-5002

文摘

In this study, a simple and systematic shape-controlled synthetic protocol for tailoring nanoscale structures to generate large and monodispersed of three-dimensional (3D) urchin-like Pt鈥揘i multipods (MPs) and spherical nanoparticles (NPs) is reported, for which the mechanism of production is elaborated in detail. We then demonstrate, for the first time, that the 3D urchin-like Pt鈥揘i MPs possess good solution processability and substantially enhance both short-circuit current density (J_sc) and fill factor (FF) and consequently increase the overall power conversion efficiencies (PCEs), because of the combination of multiple scattering processes of incident light, improved conductivity, and facilitating the charge transport in the active layer. PSC fabricated using 5% Pt鈥揘i MPs embedded in a blend of poly{[4,8-bis(2-ethyl-hexyl-thiophene-5-yl)-benzo[1,2-b:4,5-b鈥瞉dithiophene-2,6-diyl]-alt-[2-(2鈥?ethyl-hexanoyl)-thieno[3,4-b]thiophen-4,6-diyl]} (PBDTTT-C-T) and [6,6]-phenyl-C₇₁-butyric acid methyl ester (PC₇₁BM) leads to compelling device PCEs of 8.48%, in comparison to 7.38% of the reference device (PBDTTT-C-T:PC₇₁BM, fabricated and tested under the same conditions). This study thus demonstrates a novel approach to enhance the photovoltaic performance, in combination with 3D urchin-like nanoalloys.