Sunday, March 7, 2010

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:PCxxBM BHJ Photovoltaic Cellsa,b
Sqr./PCxxBM
(wt:wt)]
dhtc
[nm]
Dald
[nm]
Jsc
[mA/cm2]
Voc
[V]
FF
[%]
PCE (PCEmax)
[%]
1/PC61BM (1:1)50653.830.49340.63(0.68)
2/PC61BM (1:1)50654.310.59340.87(0.99)
1/PC61BM (1:3)75354.130.54330.77(0.78)
2/PC61BM (1:3)75355.150.56371.10(1.20)
2/PC61BM (1:3)e75355.680.59391.34(1.45)
1/PC71BM (1:3)75356.400.52351.12(1.29)
2/PC71BM (1:3)75358.210.56371.72(1.75)
1/PC71BM (1:3)e75507.160.55371.39(1.47)
2/PC71BM (1:3)e75359.320.57371.99(2.05)


Friday, March 5, 2010

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.

DonorAnnealing 150 °C, 15 sVoc [V]Jsc [mA cm-2]FF [%] [a]

4No0.58-0.180.310.03
4Yes0.61-0.170.320.03
5No0.84-1.690.370.53
5Yes0.87-2.030.601.06
6No0.93-1.870.450.78
6Yes0.90-2.680.611.46

[a] = Jsc × Voc × FF.

10.1002/adfm.200901827