- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Efficiency Limits of Underwater Solar Cells
摘要： Operation of underwater vehicles and autonomous systems is currently limited by the lack of long-lasting power sources. These systems could potentially be powered using underwater solar cells, but the material requirements to achieve their full potential are not well understood. Using detailed-balance calculations, we show that underwater solar cells can exhibit efficiencies from ~55% in shallow waters to more than 65% in deep waters, while maintaining a power density >5 mW cm?2. We show that the optimum band gap of the solar cell shifts by ~0.6 eV between shallow and deep waters and plateaus at ~2.1 eV at intermediate depths, independent of geographical location. This wide range in optimum band-gap energies opens the potential for a library of wide-band-gap semiconductors to be used for high-efficiency underwater solar cells. Our results provide a roadmap for proper choice of underwater solar cell materials, given the conditions at points of use.
关键词： wide-band-gap semiconductors,detailed-balance calculations,efficiency limits,power density,underwater solar cells
更新于2025-09-23 15:19:57
-
[IEEE 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Ottawa, ON, Canada (2019.7.8-2019.7.12)] 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Wurtzite InGaN/GaN Quantum Dots for Intermediate Band Solar Cells
摘要： Wurtzite InGaN quantum dots in GaN are investigated for intermediate band solar cells. A global limiting power conversion ef?ciency of 44% is predicted through detailed balance calculations with full freedom of allowed subgap transitions. We consider cylindrical quantum dots, predicting band structures using an 8-band k.p model, including deformation potential and piezoelectric ?elds from induced lattice strain. Taking the energy levels from the k.p model as absorption cutoffs in the detailed balance calculation, we determine the best device ef?ciency possible as a function of indium fraction and dot size. For small dots, of size ≈ 50 ?A and indium fraction ≈ 0.7, ef?ciencies up to 42% are in principle attainable under 1-sun illumination.
关键词： Quantum Dots,Intermediate Band Solar Cells,Detailed Balance Calculations,8-band k.p model,Wurtzite InGaN
更新于2025-09-11 14:15:04