Boosting Perovskite Photodetector Performance in NIR Using Plasmonic Bowtie Nanoantenna Arrays.,Small

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Boosting Perovskite Photodetector Performance in NIR Using Plasmonic Bowtie Nanoantenna Arrays.
Small ( IF 13.0 ) Pub Date : 2020-05-14 , DOI: 10.1002/smll.202001417
Bin Wang _{1,

2} , Yuting Zou _{1,

2} , Huanyu Lu _{2,

3} , Wenchi Kong _{1,

2} , Subhash C Singh _{1,

4} , Chen Zhao _{1,

2} , Chaonan Yao _{1,

2} , Jun Xing _{1,

2} , Xin Zheng _{1,

2} , Zhi Yu ₁ , Cunzhu Tong ₃ , Wei Xin ₁ , Weili Yu ₁ , Bo Zhao ₁ , Chunlei Guo _{1,

4}

Affiliation

Triple‐cation mixed metal halide perovskites are important optoelectronic materials due to their high photon to electron conversion efficiency, low exciton binding energy, and good thermal stability. However, the perovskites have low photon to electron conversion efficiency in near‐infrared (NIR) due to their weak intrinsic absorption at longer wavelength, especially near the band edge and over the bandgap wavelength. A plasmonic functionalized perovskite photodetector (PD) is designed and fabricated in this study, in which the perovskite ((Cs_0.06FA_0.79MA_0.15)Pb(I_0.85Br_0.15)₃) active materials are spin‐coated on the surface of Au bowtie nanoantenna (BNA) arrays substrate. Under 785 nm laser illumination, near the bandedge of perovskite, the fabricated BNA‐based plasmonic PD exhibits ≈2962% enhancement in the photoresponse over the Si/SiO₂‐based normal PD. Moreover, the detectivity of the plasmonic PD has a value of 1.5 × 10¹² with external quantum efficiency as high as 188.8%, more than 30 times over the normal PD. The strong boosting in the plasmonic PD performance is attributed to the enhanced electric field around BNA arrays through the coupling of localized surface plasmon resonance. The demonstrated BNA‐perovskite design can also be used to enhance performance of other optoelectronic devices, and the concept can be extended to other spectral regions with different active materials.

中文翻译：

使用等离子领结纳米天线阵列提高NIR中钙钛矿光电探测器的性能。

三阳离子混合金属卤化物钙钛矿是重要的光电材料，因为它们具有高的光子-电子转换效率，低激子结合能和良好的热稳定性。然而，由于钙钛矿在较长波长（尤其是在带边附近和在带隙波长附近）在较长波长处的固有吸收较弱，因此它们在近红外（NIR）中具有较低的光子至电子转换效率。在本研究中设计并制造了等离子体功能化的钙钛矿光电探测器（PD），其中钙钛矿（（Cs _0.06 FA _0.79 MA _0.15）Pb（I _0.85 Br _0.15）₃）将活性材料旋涂在金领结纳米天线（BNA）阵列基板的表面上。在785 nm激光照射下，在钙钛矿的带状边缘附近，与基于Si / SiO ₂的普通PD相比，基于BNA的等离子PD的光响应增强了2962％。此外，等离子PD的检测值为1.5×10 ¹²外部量子效率高达188.8％，是正常PD的30倍以上。通过局部表面等离子体激元共振的耦合，等离子体激元PD性能的强劲提升归因于BNA阵列周围增强的电场。演示的BNA-钙钛矿设计还可以用于增强其他光电设备的性能，并且该概念可以扩展到具有不同活性材料的其他光谱区域。

更新日期：2020-06-18

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