High-performance and -stability graphene quantum dots-mixed conducting polymer/porous Si hybrid solar cells with
Dong Hee Shin1, Seung Hyun Shin1, Sung Kim2
1Department of Applied Physics and Institute of Natural Sciences, Kyung Hee University, Yongin 17104, Republic of Korea.
Abstract:
Recently, conducting polymer/Si hybrid solar cells (HSCs) based on simple fabrication processes have become highly attractive due to their low cost, but low conductivity of the polymer, high reflection index of Si, and large recombination loss on the Si back contact are major drawbacks that should be solved for the practical applications. Here, we first report HSCs composed of graphene quantum dots (GQDs)-mixed poly (3,4-ethylenedioxythiophene) (PEDOT:GQDs)/ porous Si (PSi)/n-Si/titanium oxide (TiO x , back passivation layer). Maximum power conversion efficiency (PCE) of 10.49% is obtained from the HSCs at an active area of 5 mm2, resulting from the enhanced conductivity of the PEDOT:GQDs, the reduced reflectivity of Si (the increased absorption) by the formation of PSi, and the prevented recombination loss at the Si backside due to the passivation. In addition, the HSCs of 16 mm2 active area maintain ∼78% (absolutely from 8.03% to 6.28%) of the initial PCE even while kept under ambient conditions for 15 d.
