Dramatic efficiency boost of single-walled carbon nanotube-silicon hybrid solar cells through exposure to ppm nitrogen dioxide in air: An ab-initio assessment of the measured device performances.,Journal of Colloid and Interface Science

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Dramatic efficiency boost of single-walled carbon nanotube-silicon hybrid solar cells through exposure to ppm nitrogen dioxide in air: An ab-initio assessment of the measured device performances.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-14 , DOI: 10.1016/j.jcis.2020.01.038
Sonia Freddi ₁ , Simona Achilli ₂ , Raffaella Soave ₃ , Stefania Pagliara ₄ , Giovanni Drera ₄ , Andrea De Poli ₄ , Francesco De Nicola ₅ , Maurizio De Crescenzi ₆ , Paola Castrucci ₆ , Luigi Sangaletti ₄

Affiliation

We observed a 73% enhancement of the power conversion efficiency (PCE) of a photovoltaic cell based on a single wall carbon nanotube/Si hybrid junction after exposing the device to a limited amount (10 ppm) of NO2 diluted in dry air. On the basis of a computational modeling of the junction, this enhancement is discussed in terms of both carbon nanotube (CNT) p-doping, induced by the interaction with the oxidizing molecules, and work function changes across the junction. Unlike studies so far reported, where the PCE enhancement was correlated only qualitatively to CNT doping, our study (i) provides a novel and reversible path to tune and considerably enhance the cell efficiency by a few ppm gas exposure, and (ii) shows computational results that quantitatively relate the observed effects to the electrostatics of the cell through a systematic calculation of the work function. These effects have been cross-checked by exposing the cell to reducing molecules (i.e·NH3) that resulted to be detrimental to the cell efficiency, consistently with the theoretical ab-initio calculations.

中文翻译：

通过暴露在空气中的ppm二氧化氮中，单壁碳纳米管-硅杂化太阳能电池的效率显着提高：从头开始评估被测器件的性能。

在将器件暴露于干燥空气中稀释的有限量（10 ppm）的NO2之后，我们观察到基于单壁碳纳米管/ Si杂化结的光伏电池的功率转换效率（PCE）提高了73％。在结的计算模型的基础上，将通过碳纳米管（CNT）p掺杂（由与氧化分子的相互作用引起的掺杂）和跨结的功函数变化来讨论这种增强。与迄今报道的研究不同，PCE的增强仅与CNT掺杂在质量上相关，我们的研究（i）提供了一种新颖且可逆的途径，以通过暴露于几ppm的气体来调节并显着提高电池效率，（ii）显示了通过对功函数的系统计算将观察到的效应与电池的静电定量关联的计算结果。通过将细胞暴露于还原性分子（即NH3）中，对这些效果进行了交叉检查，这与理论上的从头算相符，从而不利于细胞效率。

更新日期：2020-01-14

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