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Title: Efficient optical absorption enhancement in organic solar cells by using a 2-dimensional periodic light trapping structure

We have investigated the effects induced by periodic nanosphere arrays on the performance of organic solar cells (OSCs). Two-dimensional periodic arrays of polystyrene nanospheres were formed by using a colloidal lithography method together with plasma etching to trim down the size to various degrees on the substrates of OSCs. It is found that the devices prepared on such substrates can have improved light harvesting, resulting in as high as 35% enhancement in power conversion efficiency over that of the reference devices. The measured external quantum efficiency and finite-difference time-domain simulation reveal that the controlled periodic morphology of the substrate can efficiently increase light scattering in the device and thus enhance the absorption of incident light.
Authors:
 [1] ;  [2] ; ; ; ; ;  [1] ;  [3]
  1. Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123 (China)
  2. (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR (China)
  3. Center of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR (China)
Publication Date:
OSTI Identifier:
22300266
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; LIGHT SCATTERING; NANOSTRUCTURES; ORGANIC SOLAR CELLS; PLASMA; POLYSTYRENE; QUANTUM EFFICIENCY; SIMULATION; SUBSTRATES; TWO-DIMENSIONAL CALCULATIONS; VISIBLE RADIATION