[12p-A402-1~17] 12.5 Organic solar cells

▼ [12p-A402-6] Morphology of Spin-coated PEDOT:PSS on Neutral Beam etched Silicon nanopillar surface for Hybrid Solar Cells

〇(M2)Aditya Saha¹, Daisuke Ohori¹, Susumu Toko¹, Sou Takeuchi¹, Seiji Samukawa^1,2 (1.IFS, Tohoku Univ., 2.AIMR, Tohoku Univ.)

Keywords:hybrid solar cell, PEDOT:PSS, nanostructured solar cell

Module cost accounts for around 30 per cent of the price of current cells at around 40,000 yen/kWh. The high vacuum and high-temperature production techniques employed in commercial Si-based solar cells set a limit to lowering prices. Organic-silicon hybrid solar cells can take advantage of low-cost processing techniques of conjugated polymers and the optoelectrical properties of Si to reduce the module cost while maintaining high performance. Achieving parity in efficiency with current inorganic solar cells has the potential to significantly drop the price of solar cells. Poly (3,4 ethylene dioxythiophene): poly styrenesulfonate (PEDOT:PSS) has been widely used due to its high conductivity and thermal stability. Previous attempts at making micro or nanostructured surfaces have faced challenges in penetration of PEDOT:PSS and formation recombination sites due to defects. We hope to improve effective contact area, charge separation and photon management of PEDOT:PSS/Si hybrid solar cells through the formation of an even thin film of PEDOT:PSS around silicon nanopillars (SiNP) etched by a damage free neutral beam etching (NBE) process. The NBE process will be able to reduce the number of surface recombination sites that tend to affect the V_oc of plasma etched nanostructures while improving the J_sc. This presentation describes the first set of trials in our project.