Geometric light trapping with a V-trap for efficient organic solar cells

Soo Jin Kim, George Y. Margulis, Seung-Bum Rim, Mark L. Brongersma, Michael D. McGehee, Peter Peumans

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The efficiency of today’s most efficient organic solar cells is primarily limited by the ability of the active layer to absorb all the sunlight. While internal quantum efficiencies exceeding 90% are common, the external quantum efficiency rarely exceeds 70%. Light trapping techniques that increase the ability of a given active layer to absorb light are common in inorganic solar cells but have only been applied to organic solar cells with limited success. Here, we analyze the light trapping mechanism for a cell with a V-shape substrate configuration and demonstrate significantly improved photon absorption in an 5.3%-efficient PCDTBT:PC70BM bulk heterojunction polymer solar cell. The measured short circuit current density improves by 29%, in agreement with model predictions, and the power conversion efficiency increases to 7.2%, a 35% improvement over the performance in the absence of a light trap.
Original languageEnglish (US)
Pages (from-to)A305
JournalOptics Express
Issue numberS3
StatePublished - Mar 14 2013
Externally publishedYes


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