Figure 4.

The current density-voltage characteristics. Solar cells with 200-nm thick planar-a-Si:H film, 200-nm thick a-Si:H nanocone, 200-nm thick a-Si:H nanocone with 10-min H₂ plasma treatment, and 200-nm thick a-Si:H nanocone and additional 10-nm a-SiH layer after 10 min H₂ plasma treatment. (a) Photovoltaic properties under AM 1.5 G light illumination (PI/N⁺ planar cell, circle with center dot; P/I nanocone/N⁺, red square; P/I nanocone + H₂ plasma/N⁺, green circle; P/I nanocone + H₂ plasma + 10 nm/N⁺, blue square) and (b) under dark condition (PI/N⁺, black square; P/I nanocone/N⁺, red circle; P/I nanocone/H₂ plasma/N⁺, green triangle; P/I nanocone/H₂ plasma/i (10 nm)/N⁺, blue inverted triangle).