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Light Trapping with Dielectric Scatterers in Single‐ and Tandem‐Junction Organic Solar Cells
Author(s) -
Tang Zheng,
Elfwing Anders,
Bergqvist Jonas,
Tress Wolfgang,
Inganäs Olle
Publication year - 2013
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201300524
Subject(s) - materials science , photocurrent , tandem , polydimethylsiloxane , dielectric , optoelectronics , solar cell , organic solar cell , plasmonic solar cell , energy conversion efficiency , polymer solar cell , trapping , optics , nanotechnology , composite material , ecology , physics , biology , polymer
Efficient dielectric scatterers based on a mixture of TiO 2 nanoparticles and polydimethylsiloxane are demonstrated for light trapping in semitransparent organic solar cells. An improvement of 80% in the photocurrent of an optimized semitransparent solar cell is achieved with the dielectric scatterer with ≈100% diffuse reflectance for wavelengths larger than 400 nm. For a parallel tandem solar cell, the dielectric scatterer generates 20% more photocurrent compared with a silver mirror beneath the cell; for a series tandem solar cell, the dielectric scatterer can be used as a photocurrent balancer between the subcells with different photoabsorbing materials. The power conversion efficiency of the tandem cell in series configuration with balanced photocurrent in the subcells exceeds that of an optimized standard solar cell with a reflective electrode. The characteristics of polydimethylsiloxane, such as flexibility and the ability to stick conformably to surfaces, also remain in the dielectric scatterers, which makes the demonstrated light trapping configuration highly suitable for large scale module manufacturing of roll‐to‐roll printed organic single‐ or tandem‐junction solar cells.