Sustainable hybrid energy harvester based on air stable quantum dot solar cells and triboelectric nanogenerator

Pak

Lee

et al. 2020

Adv Funct Materials

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Smart wearable electronics that are fabricated on light‐weight fabrics or flexible substrates are considered to be of next‐generation and portable electronic device systems. Ideal wearable and portable applications not only require the device to be integrated into various fiber form factors, but also desire self‐powered system in such a way that the devices can be continuously supplied with power as well as simultaneously save the acquired energy for their portability and sustainability. Nevertheless, most of all self‐powered wearable electronics requiring both the generation of the electricity and storing of the harvested energy, which have been developed so far, have employed externally connected individual energy generation and storage fiber devices using external circuits. In this work, for the first time, a hybrid smart fiber that exhibits a spontaneous energy generation and storage process within a single fiber device that does not need any external electric circuit/connection is introduced. This is achieved through the employment of asymmetry coaxial structure in an electrolyte system of the supercapacitor that creates potential difference upon the creation of the triboelectric charges. This development in the self‐charging technology provides great opportunities to establish a new device platform in fiber/textile‐based electronics.

Section: Methodsmentioning

confidence: 99%

Hybrid Smart Fiber with Spontaneous Self‐Charging Mechanism for Sustainable Wearable Electronics

Pak

Lee

et al. 2020

Adv Funct Materials

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“…Using a TENG, in 2018, Cho et al . reported a hybrid TENG and a lead sulphide (PbS) QDSC energy harvester for a reliable and sustainable sensor system to realize IoT technology as the IoT is a prerequisite condition in the era of smart life which will enrich lives of human beings in the near future . This work suggested two possible routes to enhance the overall performance of the hybrid energy harvester: (1) By employing a highly transparent poly(vinylidenefluoride‐trifluoroethylene‐chlorotrifluoroethylene) (P(VDF‐TrFE‐CTFE)) and graphene electrode, the hybrid energy harvester maximized absorption of sunlight coming to PbS QD layers as shown in Figure (a); (2) In order to increase V oc of a solar cell, six patterned indium tin oxides (ITOs) connected in series were used as shown in Figure (b).…”

Section: Integration Of a Quantum Dot Solar Cell For A Hybrid Energy mentioning

confidence: 99%

“…The hybrid system has been successfully demonstrated by two different approaches; (1) an integration of various energy harvesters and (2) utilization of a piezotronic/ piezo‐phototronic effect. These fields are experiencing unprecedentedly fast progress in recent years …”

Section: Introductionmentioning

confidence: 99%

Quantum Dots for Hybrid Energy Harvesting: From Integration to Piezo‐Phototronics

Israel Journal of Chemistry

Pak

et al. 2019

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Energy harvesting, which converts wasted environmental energy into electricity by utilizing various physical effects, hasattracted tremendous research interests as is one of the key technologies to realize advanced electronics in the future. In this review, we introduce recent progress in the field of hybrid energy harvesting technology. In particular, we focus on a quantum dots (QD)‐based hybrid energy harvesting device. Attributed to fascinating material properties that QD possess, employment of QDs into hybrid energy harvesting has shown great potential for independent and sustainable energy supply.First, an integration of a QD solar cell into a mechanical energy harvester is discussed to harness different types of environmental energy sources simultaneously. Second, a comprehensive explanation of a piezotronic and piezo‐phototronic effect is provided, which is followed by QD‐based piezo‐phototronic applications. Finally, we summarize recent progress that has been made in energy harvesting technology involving a photovoltaic and piezo/triboelectric effect

“…Colloidal quantum dots (CQDs), as an emerging class of materials for PDs, have attracted intense attention due to their outstanding material properties, such as broad absorption spectrum, high absorption coefficient, solution processability, low-cost manufacturing, and size-tunable optoelectronic properties (Cho et al, 2017;Cho et al, 2018a;Cho et al, 2018b;Hao et al, 2020;Hou et al, 2020;Xu et al, 2020). Owing to these advantages, to date, CQD-based PDs have achieved broadband photodetection from the deep ultraviolet (DUV) to mid-infrared (MIR) region, ultrahigh photoresponsivity and detectivity, longterm stability, and fast rise and fall time.…”

Section: Introductionmentioning

confidence: 99%

Toward Green Optoelectronics: Environmental-Friendly Colloidal Quantum Dots Photodetectors

Miao

2021

Front. Energy Res.

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Colloidal quantum dots (CQDs) have attracted tremendous research interests in future-generation energy, electronic, optoelectronic, and bio-imaging applications due to their fascinating material properties, such as solution processability at room temperature and under ambient conditions, compatibility with various functional materials, and high photostability as well as photosensitivity. Among the various optoelectronic applications of CQDs, optical light sensors, which convert photonic energy into electrical signals, have been of particular interest because they are one of the key building blocks for modern communication and imaging applications, including medical X-ray and near-infrared imaging, visible light cameras, and machine vision. However, CQDs, which have been widely researched for photodetectors (PDs) so far, contain toxic and hazardous heavy metals, namely, lead (Pb), cadmium (Cd), and mercury (Hg). These substances are extremely toxic and harmful to the environment as well as human beings. Therefore, it is highly desirable to substitute CQDs containing heavy metals with nontoxic and environmentally friendly ones to realize green optoelectronics. In this review article, we introduce various kinds of heavy metal–free CQDs and their PD applications. This article comprehensively includes working mechanisms of PDs, various kinds of nontoxic and environmentally friendly CQD-based PDs, advanced heterojunction PDs, and discussion for future perspectives.