Flexible and Semi-Transparent Silicon Solar Cells as a Power Supply to Smart Contact Lenses

Pourshaban, Erfan; Banerjee, Aishwaryadev; Deshpande, Adwait; Ghosh, Chayanjit; Karkhanis, Mohit; Hasan, Rabiul; Rock, Nathan D.; Kim, Hanseup; Mastrangelo, Carlos H.

doi:10.1021/acsaelm.2c00665

Cited by 15 publications

(6 citation statements)

References 35 publications

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“…105 Others are exploring the use of wireless charging, which would allow the lenses to be charged without the need for a physical connection. 106 Another challenge is ensuring the safety and biocompatibility of the materials used in e-CLs. CLs are worn directly on the eye, which means that any material used in their construction must be nontoxic and nonirritating.…”

Section: Health Monitoring By E-clsmentioning

confidence: 99%

“…For example, some researchers are developing lenses that can harvest energy from the wearer’s movements, using tiny generators, cells, or piezoelectric materials . Others are exploring the use of wireless charging, which would allow the lenses to be charged without the need for a physical connection . Another challenge is ensuring the safety and biocompatibility of the materials used in e-CLs.…”

Section: Current State Of E-cls Technologymentioning

confidence: 99%

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The Future of Vision: A Review of Electronic Contact Lenses Technology

et al. 2023

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The field of vision correction is constantly evolving to meet the increasing demand for more advanced and personalized solutions. Electronic contact lenses (e-CLs) are a new and emerging technology that has the potential to revolutionize this field and change the way we see and interact with the world. This Review provides a comprehensive overview of e-CL technology, including the current state of the technology, the different types of e-CLs that exist, and their benefits and limitations. It also discusses recent advancements and innovations in e-CL technology, as well as the various applications of e-CLs in healthcare, sports, and entertainment. Safety and ethical considerations surrounding the use of e-CLs are also addressed. Additionally, the Review offers an outlook on the future of e-CL technology and explores how these devices may change the way we interact with technology and the world around us. Overall, this Review aims to provide a comprehensive understanding of e-CL technology and its potential impact on the field of vision correction.

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Section: Health Monitoring By E-clsmentioning

confidence: 99%

Section: Current State Of E-cls Technologymentioning

confidence: 99%

The Future of Vision: A Review of Electronic Contact Lenses Technology

et al. 2023

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“…An adaptive SCL microsystem should consist of a scleral eye-tracking distance ranger [12]- [14], a compact energy source [15]- [19] and most importantly, an electro-optical tunable lens which provides different distance-dependent optical powers [20], [21]. For this application, the tunable lens must consume very little power yet provide adequate accommodation (~4D) with low actuation voltages.…”

Section: Scl Microsystem Requirementsmentioning

confidence: 99%

Refractive-type Varifocal Liquid-crystal Fresnel lenses for smart contacts

Banerjee¹,

Ghosh²,

Karkhanis³

et al. 2023

Preprint

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We demonstrate the implementation of a low-power, low-profile, varifocal liquid-crystal Fresnel lens stack suitable for tunable imaging in smart contact lenses. The lens stack consists of a high-order refractive-type liquid crystal Fresnel chamber, a voltage-controlled twisted nematic cell, a linear polarizer and a fixed offset lens. The lens stack has an aperture of 4 mm and thickness is ~980 μm. The varifocal lens requires ~2.5 VRMS for a maximum optical power change of ~6.5 D consuming electrical power of ~2.6 µW. The maximum RMS wavefront aberration error was 0.2 µm and the chromatic aberration was 0.008 D/nm. The average BRISQUE image quality score of the Fresnel lens was 35.23 compared to 57.23 for a curved LC lens of comparable power indicating a superior Fresnel imaging quality.

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“… 15 Micro-machining 1 HJ 6.5 504 51.5 1.7 Encapsulated by PDMS; Flexible; Ref. 53 . 14.8 Alkali etching 0.23 DF 25.8 550 46.6 6.6 Free-standing; Flexible; Ref.…”

Section: Introductionmentioning

confidence: 99%

Free-standing ultrathin silicon wafers and solar cells through edges reinforcement

Wu,

Liu,

Lin

et al. 2024

Nat Commun

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Crystalline silicon solar cells with regular rigidity characteristics dominate the photovoltaic market, while lightweight and flexible thin crystalline silicon solar cells with significant market potential have not yet been widely developed. This is mainly caused by the brittleness of silicon wafers and the lack of a solution that can well address the high breakage rate during thin solar cells fabrication. Here, we present a thin silicon with reinforced ring (TSRR) structure, which is successfully used to prepare free-standing 4.7-μm 4-inch silicon wafers. Experiments and simulations of mechanical properties for both TSRR and conventional thin silicon structures confirm the supporting role of reinforced ring, which can share stress throughout the solar cell preparation and thus suppressing breakage rate. Furthermore, with the help of TSRR structure, an efficiency of 20.33% (certified 20.05%) is achieved on 28-μm silicon solar cell with a breakage rate of ~0%. Combining the simulations of optoelectrical properties for TSRR solar cell, the results indicate high efficiency can be realized by TSRR structure with a suitable width of the ring. Finally, we prepare 50 ~ 60-μm textured 182 × 182 mm2 TSRR wafers and perform key manufacturing processes, confirming the industrial compatibility of the TSRR method.

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Flexible and Semi-Transparent Silicon Solar Cells as a Power Supply to Smart Contact Lenses

Cited by 15 publications

References 35 publications

The Future of Vision: A Review of Electronic Contact Lenses Technology

The Future of Vision: A Review of Electronic Contact Lenses Technology

Refractive-type Varifocal Liquid-crystal Fresnel lenses for smart contacts

Free-standing ultrathin silicon wafers and solar cells through edges reinforcement

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