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

Freddi, Sonia; Achilli, Simona; Soave, Raffaella; Pagliara, Stefania; Drera, Giovanni; Poli, Andrea De; Nicola, Francesco De; Crescenzi, M. De; Castrucci, P.; Sangaletti, L.

doi:10.1016/j.jcis.2020.01.038

Cited by 6 publications

(5 citation statements)

References 47 publications

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“…The reduction of I SC and V OC was consistent with the p-doping of CNTs and with the reducing character of ammonia. The reverse behavior is expected for exposure to oxidizing NO 2 molecules, as reported for similar cells in [ 52 ].…”

Section: Resultssupporting

confidence: 53%

“…As discussed in detail in [ 52 ], the V OC reduction can be ascribed to a decrease in the CNT work function due to electron transfer from NH 3 to the CNT layer. According to the theory for a Schottky junction solar cell, the V OC can be related to the barrier height Φ B at the interface as follows: V OC = n Φ B + (nkT/q)ln(J L /A* T 2 ) where n is the junction ideality factor, T is the temperature, k is the Boltzmann constant, J L is the junction saturation current density, and A* is the Richardson constant.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the change in the work function of the nanotube through adsorption is expected to influence the cell performance through a change of the barrier height. In the case of ammonia absorption, theoretical calculations [ 52 ] have shown that NH 3 molecules down-shift the CNT work function, ultimately leading to a V OC reduction.…”

Section: Resultsmentioning

confidence: 99%

“…The larger effect observed in the former case can be related to a reduction of R sh , the parallel resistance in the equivalent circuit of the cell ( Figure 1 a), yielding a voltage drop across the junction. Equivalently, the effect of interaction with ammonia on charge transport across the junction can be rationalized in terms of a change in the CNT work function [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

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Gas Sensing with Solar Cells: The Case of NH3 Detection through Nanocarbon/Silicon Hybrid Heterojunctions

Drera

Freddi

et al. 2020

Nanomaterials

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Photovoltaic (PV) cells based on single-walled carbon nanotube (SWCNT)/silicon (Si) and multiwalled carbon nanotube (MWCNT)/Si junctions were tested under exposure to NH3 in the 0–21 ppm concentration range. The PV cell parameters remarkably changed upon NH3 exposure, suggesting that these junctions, while being operated as PV cells, can react to changes in the environment, thereby acting as NH3 gas sensors. Indeed, by choosing the open-circuit voltage, VOC, parameter as read-out, it was found that these cells behaved as gas sensors, operating at room temperature with a response higher than chemiresistors developed on the same layers. The sensitivity was further increased when the whole current–voltage (I–V) curve was collected and the maximum power values were tracked upon NH3 exposure.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Gas Sensing with Solar Cells: The Case of NH3 Detection through Nanocarbon/Silicon Hybrid Heterojunctions

Drera

Freddi

et al. 2020

Nanomaterials

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“…For years, nanostructured carbon has been an incredibly active field of research [ 85 , 86 , 87 , 88 ]. In particular, due to their physical and chemical properties, including high surface-to-volume ratio [ 89 ], high sensitivity to the surface adsorption of gas molecules [ 90 ], and low electrical intrinsic noise [ 91 ], graphene and carbon nanotubes are still receiving great attention in the gas sensors and electronic noses field [ 92 , 93 , 94 , 95 ].…”

Section: Selected Categories Of Ultrafast Chemiresistorsmentioning

confidence: 99%

Disclosing Fast Detection Opportunities with Nanostructured Chemiresistor Gas Sensors Based on Metal Oxides, Carbon, and Transition Metal Dichalcogenides

Galvani,

Freddi,

Sangaletti

2024

Sensors

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With the emergence of novel sensing materials and the increasing opportunities to address safety and life quality priorities of our society, gas sensing is experiencing an outstanding growth. Among the characteristics required to assess performances, the overall speed of response and recovery is adding to the well-established stability, selectivity, and sensitivity features. In this review, we focus on fast detection with chemiresistor gas sensors, focusing on both response time and recovery time that characterize their dynamical response. We consider three classes of sensing materials operating in a chemiresistor architecture, exposed to the most investigated pollutants, such as NH3, NO2, H2S, H2, ethanol, and acetone. Among sensing materials, we first selected nanostructured metal oxides, which are by far the most used chemiresistors and can provide a solid ground for performance improvement. Then, we selected nanostructured carbon sensing layers (carbon nanotubes, graphene, and reduced graphene), which represent a promising class of materials that can operate at room temperature and offer many possibilities to increase their sensitivities via functionalization, decoration, or blending with other nanostructured materials. Finally, transition metal dichalcogenides are presented as an emerging class of chemiresistive layers that bring what has been learned from graphene into a quite large portfolio of chemo-sensing platforms. For each class, studies since 2019 reporting on chemiresistors that display less than 10 s either in the response or in the recovery time are listed. We show that for many sensing layers, the sum of both response and recovery times is already below 10 s, making them promising devices for fast measurements to detect, e.g., sudden bursts of dangerous emissions in the environment, or to track the integrity of packaging during food processing on conveyor belts at pace with industrial production timescales.

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Insights into the application of carbon materials in heterojunction solar cells

Deng

Liu

et al. 2023

Materials Science and Engineering: R: Reports

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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

Cited by 6 publications

References 47 publications

Gas Sensing with Solar Cells: The Case of NH3 Detection through Nanocarbon/Silicon Hybrid Heterojunctions

Gas Sensing with Solar Cells: The Case of NH3 Detection through Nanocarbon/Silicon Hybrid Heterojunctions

Disclosing Fast Detection Opportunities with Nanostructured Chemiresistor Gas Sensors Based on Metal Oxides, Carbon, and Transition Metal Dichalcogenides

Insights into the application of carbon materials in heterojunction solar cells

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