Recent advances in wearable self-powered energy systems based on flexible energy storage devices integrated with flexible solar cells

Zhao, Jing; Zha, Jiajia; Zeng, Zhiyuan; Tan, Chaoliang

doi:10.1039/d1ta02493k

Cited by 66 publications

(33 citation statements)

References 135 publications

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“…It can be observed that the conductivity increases exponentially with the applied voltage at stage II, whereas ∇E Fn and ∇E Fp change relatively slowly, and results in the variation in leakage current being dictated by the variation in conductivity of the regions along path I (note that in fact the path in the x direction of leakage current I 2 is mainly composed of path I) at stage II. Consequently, the leakage current varies exponentially with the voltage at stage II and the value of the ideality factor m in Equation ( 2) should be 2 according to Equation (10). At stage III, the QFLS of the regions along path I is saturated, that is, E Fn -E Fp is a constant or varies particularly little.…”

Section: Theoretical Analysis Of Linear Exponential Variation or Satu...mentioning

confidence: 99%

“…[9] With the continuous improvement of photoelectric conversion efficiency, solar energy accounts for an increasing share of the energy supply system, gradually becoming one of the main alternatives to fossil energy. [10] For most electronics, the operating voltage is generally 1.5$12.0 V (i.e., a few dry batteries or button batteries). For example, the silicon impact ionization metal-oxide-semiconductor (I-MOS) fieldeffect transistors require a supply voltage of $5.5 V. [11,12] Concerning the conventional single junction solar cells, the open-circuit voltage (V OC ) depends on the bandgap of the semiconductor material and the intensity of sunlight.…”

Section: Introductionmentioning

confidence: 99%

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Realization of High‐Voltage Output on Monolithic Silicon Solar Cells in Series for Self‐Powered Systems

Lin

Chen

et al. 2022

Solar RRL

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Crystalline silicon solar cells dominate the photovoltaic market nowadays. However, they are rarely used in self‐powered systems (with an operating voltage of 1.5∼12.0 V) mainly because of the low integration of silicon solar cell modules, which need slicing and then series connection. Herein, a series‐interconnected solar cell which can be prepared on a monolithic silicon wafer, with the capability to output high voltage by controlling the number of sub‐cells, is proposed. Further, based on a technology computer aided design (TCAD) numerical simulation, an in‐depth analysis of an unconventional non‐shunt resistance type of leakage mechanism under electric and light injection which has not been reported before is proposed and performed, finding that the leakage current can be divided into three stages that are closely related to the variation in the conductivity (resistance) of the transition region (TR) under injection conditions. Then, several targeted methods especially an unusual method of increasing the recombination to constrain the rise in conductivity in TR are proposed to improve its efficiency by suppressing leakage current at different stages. Finally, simulation reveals that the proposed monolithic on‐chip solar micromodules enable not only high voltage but also high efficiency (≥24.0%), which well meets the requirements of self‐powered systems at low cost.

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Section: Theoretical Analysis Of Linear Exponential Variation or Satu...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Realization of High‐Voltage Output on Monolithic Silicon Solar Cells in Series for Self‐Powered Systems

Lin

Chen

et al. 2022

Solar RRL

View full text Add to dashboard Cite

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“…Self-powered health monitoring systems are employed mainly to track the health vitals of players during exercise and training and for the regular health monitoring of elders. These systems are usually powered by batteries charged either by a conventional power source or by wearable energy harvesting devices, i.e., ferroelectric, thermoelectric, triboelectric, and piezoelectric [1]. Currently, our lives have been dramatically changed with the emergence of these wearable health monitoring systems.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Materials for Wearable Thermoelectric Generators and Biosensing Devices

Sattar

Yeo

2022

Materials

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Recently, self-powered health monitoring systems using a wearable thermoelectric generator (WTEG) have been rapidly developed since no battery is needed for continuous signal monitoring, and there is no need to worry about battery leakage. However, the existing materials and devices have limitations in rigid form factors and small-scale manufacturing. Moreover, the conventional bulky WTEG is not compatible with soft and deformable tissues, including human skins or internal organs. These limitations restrict the WTEG from stabilizing the thermoelectric gradient that is necessary to harvest the maximum body heat and generate valuable electrical energy. This paper summarizes recent advances in soft, flexible materials and device designs to overcome the existing challenges. Specifically, we discuss various organic and inorganic thermoelectric materials with their properties for manufacturing flexible devices. In addition, this review discusses energy budgets required for effective integration of WTEGs with wearable biomedical systems, which is the main contribution of this article compared to previous articles. Lastly, the key challenges of the existing WTEGs are discussed, followed by describing future perspectives for self-powered health monitoring systems.

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“…Simultaneously, a gradual thinning of Si wafers for reduction of the panel cost takes place. This search for a thinner light absorbing layer is additionally motivated by the much wider flexible SC applicability [5][6][7] . Therefore, modern Si SC industry has been narrowed down to the motto "thinner & cheaper" resulted in 10-fold decrease in thickness (20 µ m) 8 representing ultrathin SC niche and extremely thin ( < 3 µ m) freestanding SC beating 12% efficiency 9 .…”

Section: Introductionmentioning

confidence: 99%

Mg$_2$Si is the new black: introducing a black silicide with $>$95% average absorption at 200-1800 nm wavelengths

Shevlyagin,

Il'yaschenko,

Kuchmizhak

et al. 2022

Preprint

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Textured silicon surface structures, in particular black silicon (b-Si), open up possibilities for Si-based solar cells and photodetectors to be extremely thin and highly sensitive owing to perfect light-trapping and anti-reflection properties. However, near-infrared (NIR) performance of bare b-Si is limited by Si band gap of 1.12 eV or 1100 nm. This work reports a simple method to increase NIR absorption of b-Si by in vacuo silicidation with magnesium. Obtained Mg 2 Si/b-Si heterostructure has a complex geometry where b-Si nanocones are covered by Mg 2 Si shells and crowned with flake-like Mg 2 Si hexagons. Mg 2 Si formation atop b-Si resulted in 5-fold lower reflectivity and optical absorption to be no lower than 88% over 200-1800 nm spectral range. More importantly, Mg 2 Si/b-Si heterostructure is more adjusted to match AM-1.5 solar spectrum with theoretically higher photogenerated current density. The maximal advantage is demonstrated in the NIR region compared to bare b-Si in full accordance with one's expectations about NIR sensitive narrow band gap ( ∼ 0.75 eV) semiconductor with high absorption coefficient, which is Mg 2 Si. Results of optical simulation confirmed the superiority of Mg 2 Si/b-Si NIR performance. Therefore, this new wide-band optical absorber called black silicide proved rather competitive alongside stateof-the-art approaches to extend b-Si spectral blackness.

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Recent advances in wearable self-powered energy systems based on flexible energy storage devices integrated with flexible solar cells

Abstract: Wearable electronics are considered to be an important technology in the next-generation smart electronics. Meanwhile, the ever-increasing energy consumption and the growing environmental awareness have highlighted the requirements of green...

Cited by 66 publications

References 135 publications

Realization of High‐Voltage Output on Monolithic Silicon Solar Cells in Series for Self‐Powered Systems

Realization of High‐Voltage Output on Monolithic Silicon Solar Cells in Series for Self‐Powered Systems

Recent Advances in Materials for Wearable Thermoelectric Generators and Biosensing Devices

Mg$_2$Si is the new black: introducing a black silicide with $>$95% average absorption at 200-1800 nm wavelengths

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