TITLE

A low band gap, solution processable oligothiophene with a dialkylated diketopyrrolopyrrole chromophore for use in bulk heterojunction solar cells

AUTHOR(S)
Tamayo, Arnold Bernarte; Xuan-Dang Dang; Walker, Bright; Junghwa Seo; Kent, Tyler; Thuc-Quyen Nguyen
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Bulk heterojunction solar cells are fabricated from blends of oligothiophene with a dialkylated diketopyrrolopyrrole chromophore:[6,6]-phenyl C71 butyric acid methyl ester. Absorption and photocurrent of the films extend to 800 nm. A power conversion efficiency (PCE) of 3.0% is obtained under simulated 100 mW/cm2 AM1.5 illumination with a 9.2 mA/cm2 short-circuit current density and an open-circuit voltage of 0.75 V. The hole and electron mobilities in the 50:50 blend are fairly balanced, 1.0×10-4 and 4.8×10-4 cm2/V s, respectively. This is the highest PCE reported to date for solar cells using solution processable small molecules.
ACCESSION #
37043751

 

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