Friday, November 20, 2009

Efficient Squaraine-Based Solution Processable Bulk-Heterojunction Solar Cells




exhibits Jsc = 5.70 mA/cm2, Voc = 0.62 V, fill-factor = 0.35, and power conversion efficiency = 1.24%

J. Am. Chem. Soc., 2008, 130 (52), pp 17640–17641
DOI: 10.1021/ja8067879

Dibenzo[f,h]thieno[3,4-b] quinoxaline-Based Small Molecules for Efficient Bulk-Heterojunction Solar Cells


sampleμe (m2 V−1 s−1)μh (m2 V−1 s−1)VOC (V)JSC (mA cm−2)FFη (%)
1/PCBM50wt%1.61×10−83.14×10−80.902.600.320.75
1/PCBM67wt%2.94×10−81.95×10−80.894.150.461.70

Org. Lett., 2009, 11 (21), pp 4898–4901

Nanoscale Phase Separation and High Photovoltaic Efficiency in Solution-Processed, Small-Molecule Bulk Heterojunction Solar Cells


Blend Ratio--Annealing Temp-------JSC-------- VOC-----FF----- h [%]
60-40--------------110--------------10.0-------- 0.92--- 0.48----4.4

Volume 19 Issue 19, Pages 3063 - 3069


A Low Band Gap, Solution Processable Oligothiophene with a Diketopyrrolopyrrole Core for Use in Organic Solar Cells

J. Phys. Chem. C, 2008, 112 (30), pp 11545–11551

J. Phys. Chem. C, 2008, 112 (39), pp 15543–15552

J. Phys. Chem. C, 2008, 112 (44), pp 17402–17407

Benzothiadiazole-Based Linear and Star Molecules: Design, Synthesis, and Their Application in Bulk Heterojunction Organic Solar Cells


solar cells fabricated with corresponding linear molecules and PC71BM. A power conversion efficiency (PCE) of 1.8%, with Jsc = 4.9 mA/cm2, Voc = 0.92 V, and FF = 0.41 was achieved with one of these star molecules.

Solution-Processable Star-Shaped Photovoltaic Organic Molecule with Triphenylamine Core and Benzothiadiazole−Thiophene Arms



The OSC device based on a blend of S(TPA-BT-4HT) and [70]PCBM (1:3, w/w) exhibited an Isc of 8.58 mA/cm2, a Voc of 0.85 V, and a FF of 32.7%, corresponding to a PCE of 2.39%, under the illumination of AM.1.5, 100 mW/cm2. The Isc of 8.58 mA/cm2 and PSC of 2.39% are among the highest values for the OSCs based on the solution-processable organic molecules reported so far.

Dibenzo[b,def]chrysene Derivatives: Solution-Processable Small Molecules that Deliver High Power-Conversion Efficiencies in Bulk Heterojunction Solar


Table 1. BHJ Solar Cell Parameters for Optimized Thickness and DBC:PCBM Ratios

device

abcd
donor material3332
DBC: PCBM (mg: mg)10:1010:1020:2010:10
solvent (1 mL)PhClCHCl3CHCl3CHCl3
optimum spin speed (rpm)3000400085004500
optimum thickness (nm)150908575
VOC (V)0.260.780.830.91
JSC (mA/cm2)0.0034.736.555.19
fill factor0.280.410.410.47
optimized efficiency, η (%)0.0051.512.252.22


10.1021/cm9028337