Marked Alkyl- vs Alkenyl-Substitutent Effects on Squaraine Dye Solid-State Structure, Carrier Mobility, and Bulk-Heterojunction Solar Cell Efficiency

DOI: 10.1021/ja100520q

Table 1. Comparison of Squaraine:PC_xxBM BHJ Photovoltaic Cells^a,b

Sqr./PCxxBM (wt:wt)]	dhtc [nm]	Dald [nm]	Jsc [mA/cm2]	Voc [V]	FF [%]	PCE (PCEmax) [%]
1/PC61BM (1:1)	50	65	3.83	0.49	34	0.63(0.68)
2/PC61BM (1:1)	50	65	4.31	0.59	34	0.87(0.99)
1/PC61BM (1:3)	75	35	4.13	0.54	33	0.77(0.78)
2/PC61BM (1:3)	75	35	5.15	0.56	37	1.10(1.20)
2/PC61BM (1:3)e	75	35	5.68	0.59	39	1.34(1.45)
1/PC71BM (1:3)	75	35	6.40	0.52	35	1.12(1.29)
2/PC71BM (1:3)	75	35	8.21	0.56	37	1.72(1.75)
1/PC71BM (1:3)e	75	50	7.16	0.55	37	1.39(1.47)
2/PC71BM (1:3)e	75	35	9.32	0.57	37	1.99(2.05)

Solution Processable Fluorenyl Hexa-peri-hexabenzocoronenes in Organic Field-Effect Transistors and Solar Cells

Device performance of BHJ solar cells with active layers consisting of 1:2 FHBC/PC61BM blends. Active layer thickness was 60-70 nm, and device area was 0.2 cm2. The numbers shown are average values over several devices.

Donor Annealing 150 °C, 15 s Voc [V] Jsc [mA cm-2] FF [%] [a] 4 No 0.58 -0.18 0.31 0.03 4 Yes 0.61 -0.17 0.32 0.03 5 No 0.84 -1.69 0.37 0.53 5 Yes 0.87 -2.03 0.60 1.06 6 No 0.93 -1.87 0.45 0.78 6 Yes 0.90 -2.68 0.61 1.46

[a] = Jsc × Voc × FF.

10.1002/adfm.200901827