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articleNo Access
DEPENDENCE OF DEVICE CHARACTERISTICS OF BULK-HETEROJUNCTION ORGANIC THIN-FILM SOLAR CELLS ON CONCENTRATION OF GLYCEROL AND SORBITOL ADDITION IN PEDOT: PSS SOLUTIONS FOR FABRICATING BUFFER LAYERS
- YUSUKE YAMAKI,
- KAZUHIRO MARUMOTO,
- TAKUYA FUJIMORI, and
- TATSUO MORI
Journal of Nonlinear Optical Physics & Materials01 Dec 2010
Preview Abstract
We have investigated the dependence of device characteristics of bulk-heterojunction organic thin-film solar cells on the concentration of glycerol and sorbitol addition in poly(3,4-ethylenedioxy thiophene):poly(4-styrene sulfonate) (PEDOT:PSS) solutions for fabricating buffer layers. The device structure is ITO/buffer/regioregular poly(3-hexylthiophene) (P3HT):[6,6]-phenyl C₆₁-butyric acid methylester (PCBM)/Al. Glycerol addition is effective for increasing power conversion efficiency (PCE) from 1.25 to 1.41% because of the increase in short-circuit current density (J_sc) without decreasing open-circuit voltage (V_oc). On the other hand, sorbitol addition decreases PCE from 1.25 to 1.04%, owing to the decrease in V_oc. This difference in V_oc behavior is ascribed to different work function of PEDOT:PSS with glycerol and sorbitol treatment.

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