Monocrystalline Silicon  Solar Cell 156 x 156mm 4.9W for DIY projects:

Material: Monocrystalline Silicon
Dimension: 156 x 156mm
Wafer Thickness: 200um (0.2mm)
Voltage: 0.66 (Open Circuit)
Current: 9.5A (Short Circuit)
Wattage: 4.9W (Max)
Efficiency: 20.8%
Front:  (-ve) Alkaline texturized surface with Silicone nitride anti-reflective coating  
Back:  (+ve) Aluminum back surface field 5x4 soldering pads

Note: Solar cell is so thin, handle with care.