Natural evolution inspired design of light trapping structure in thin film organic solar cells

Chen Wang; Shuangcheng Yu; Wei Chen; Cheng Sun

doi:10.1117/12.2024775

11 September 2013 Natural evolution inspired design of light trapping structure in thin film organic solar cells

Chen Wang, Shuangcheng Yu, Wei Chen, Cheng Sun

Proceedings Volume 8823, Thin Film Solar Technology V; 88230C (2013) https://doi.org/10.1117/12.2024775
Event: SPIE Solar Energy + Technology, 2013, San Diego, California, United States

Abstract

Light trapping has been developed to effectively enhance the efficiency of the thin film solar cell by extending the pathlength for light interacting with the active materials. Searching for optimal light trapping design requires a delicate balance among all the competing physical processes, including light refraction, reflection, and absorption. The existing design methods mainly depend on engineers’ intuition to predefine the topology of the light-trapping structure. However, these methods are not capable of handling the topological variation in reaching the optimal design. In this work, a systematic approach based on Genetic Algorithm is introduced to design the scattering pattern for effective light trapping. Inspired by natural evolution, this method can gradually improve the performance of light trapping structure through iterative procedures, producing the most favorable structure with minimized reflection and substantial enhancement in light absorption. Both slot waveguide based solar cell and a more realistic organic solar with a scattering layer consisting of nano-scale patterned front layer is optimized to maximize absorption by strongly coupling incident sun light into the localized photonic modes supported by the multilayer system. Rigorous coupled wave analysis (RCWA) is implemented to evaluate the absorbance. The optimized slot waveguide cell achieves a broadband absorption efficiency of 48.1% and more than 3-fold increase over the Yablonovitch limit and the optimized realistic organic cell exhibits nearly 50% average absorbance over the solar spectrum with short circuit current density five times larger than the control case using planar ITO layer.

Citation Download Citation

Chen Wang, Shuangcheng Yu, Wei Chen, and Cheng Sun "Natural evolution inspired design of light trapping structure in thin film organic solar cells", Proc. SPIE 8823, Thin Film Solar Technology V, 88230C (11 September 2013); https://doi.org/10.1117/12.2024775

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available