An 11%-Power-Conversion-Efficiency Organic-Inorganic Hybrid Solar Cell Achieved by Facile Organic Passivation

Ultrathin (< 5 nm) polymer layers formed on crystalline silicon by solution deposition are used as surface passivation layers to realize highly efficient organic-inorganic solar cells. A conductive polymer is then deposited on the passivated silicon surface as a hole transporting layer to fabricate Schottky solar cells. The solar cell with a polyethylenimine passivation layer exhibits an excellent efficiency of 11%. The devices are fabricated by a simple solution-based spin-coating method at low temperature (< 150 degrees C), which may be used to produce efficient organic-inorganic hybrid solar cells at low cost.