Dr. Sayan Roy Profile

Dr. Sayan Roy

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Proceedings Article | 26 September 2023 Presentation + Paper

Ultra-thin transition metal di-chalcogenides (TMDCs) as radiation-resistant photovoltaic materials for space

Sayan Roy, Peter Bermel

Proceedings Volume 12668, 1266804 (2023) https://doi.org/10.1117/12.2677924

KEYWORDS: Solar cells, Photovoltaics, Selenium, Tellurium, Transition metals, Optical properties, Sulfur, Solar energy

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Transition metal di-chalcogenides (TMDCs) have strong potential for ultra -thin electronic and photonic applications because of their range of electronic and optical properties, 2D layered structure, and tunability of properties by dopants and hybrid alloys. TMDCs have high atomic masses compared to commonly used semiconductors, which makes them resistant to damage by high energy particles in space. We have studied the fundamental electronic and optical properties of various tungsten-based TMDCs by Density Functional Theory (DFT) calculations. We then developed a solar cell model composed of heavier TMDCs with photon management features to design high-performing photovoltaic devices which are ultra-thin, lightweight, with significantly enhanced resistance to radiation-induced damage. Here, we model electro-optic properties and photovoltaic performance of various combinations of tungsten-based TMDCs containing sulfur, selenium and tellurium. Device simulations conducted using the AM0 space solar spectrum yield high efficiencies above 17% for the tungsten-based devices. The non-ionizing energy loss (NIEL) due to high energy protons for tungsten-based TMDCs are much lower than common photovoltaic semiconductors, such as silicon, resulting in significantly reduced displacement damage doses (DDD) from space radiation. Our results show that TMDCs have great potential for implementation in radiation-resistant electronic and photonic technologies in the space environment.

Proceedings Article | 5 August 2021 Presentation + Paper

Performance enhancement of ultra-thin TMDC-based photovoltaic systems for space applications

Sayan Roy, Peter Bermel

Proceedings Volume 11824, 1182404 (2021) https://doi.org/10.1117/12.2594390

KEYWORDS: Solar cells, Absorption, Photovoltaics, Antireflective coatings, Performance modeling

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There is a great demand for high performance materials and technology in space photovoltaics (PV) to meet the power needs of satellites. Transition Metal Di-Chalcogenides (TMDCs) are strong candidates for such applications, as they are very lightweight and resilient to high energy radiation, compared to most PV semiconductors. We have modeled an ultra-thin photovoltaic system based on tungsten disulfide (WS2) and demonstrated performance enhancement by addition of light trapping and anti-reflection coating. Our photovoltaic model consists of a 100 nm thick WS2-based heterojunction solar cell, similar to the Hetero Junction Intrinsic Thin Layer (HIT) solar cell structure. A 1-D grating light trapping structure has been implemented using silver as the reflector material, with the grating period and thickness optimized for highest absorption enhancement. An antireflection coating layer was added to further enhance absorption, with the thickness optimized to minimize surface reflection. We have simulated our model under AM0 solar spectrum over the temperature range of geostationary satellite orbits (313-343K). The baseline photovoltaic model design was calculated to have an efficiency around 12%. The absorption enhancement from light trapping increased the short-circuit current (JSC) by 25%, which gave an efficiency around 16%. The additional absorption due to anti-reflection coating increased the JSC by a further 15%, leading to efficiency around 19%. In addition, TMDC-based solar cells have lower temperature coefficient for efficiency degradation compared to low bandgap semiconductor solar cells. These results show that our TMDC-based photovoltaic system with light trapping and anti-reflection coating is a strong candidate for space photovoltaic applications.

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