Author/Authors :
Nara Cho، نويسنده , , Hyunbong Choi، نويسنده , , Duckhyun Kim، نويسنده , , Kihyung Song، نويسنده , , Moon-Sung Kang، نويسنده , , Sang Ook Kang، نويسنده , , JAEJUNG KO، نويسنده ,
Abstract :
Three organic sensitizers JK-87, JK-88, and JK-89 containing a bulky spirobifluorene unit in the bridged group are designed and synthesized. Under standard global A.M. 1.5 solar condition, the JK-89 sensitized cell gave a short-circuit photocurrent density (Jsc) of 13.02 mA cm−2, an open-circuit voltage (Voc) of 0.75 V, and a fill factor of 0.70, corresponding to an overall conversion efficiency η of 6.83%. The η of JK-89 is higher than those of other two cells due to the larger Jsc. The improved Jsc value is mainly attributed to the broad and red-shifted absorption band.
