Date, Time and Venue

Date & Time: July 24, 2014, 17:30～
Venue: 1F Seminar Room, Material Solutions Center, Katahira Campus, Tohoku University, Sendai, Japan
　　　　　("C5" building in Campus map)

 

Co-Sponsors

Core Technology Consortium for Advanced Energy Devices
Innovative Energy Research Center, Institute of Fluid Science, Tohoku University

 

Lecturer

Professor Peichen Yu

(Department of Photonics, National Chiao-Tung University, Taiwan)

 

Topic

In this talk, we will discuss strategies to realize all-solution processed hybrid organic -silicon heterojunction solar cells. First, hybrid solar cells are demonstrated based on a conjugate polymer PEDOT:PSS directly spun-cast on a micro-textured n-type crystalline silicon wafer, which is compatible with current industrial processes. The fabrication conditions suggest that the organic coverage on the textured surface is excellent and key to achieve high efficiency, leading to an average power conversion efficiency of 9.84% on 0.3 x 0.3 cm2 cells. A one-dimensional drift-diffusion model is further developed based on fitting the device characteristics with experimentally determined PEDOT:PSS parameters. The projected power conversion efficiency can potentially exceed 20% via the control of surface reflection, interface defect density, rear surface recombination, etc. Second, we employ low-cost, solution-processed silver-nanowire meshes to enable efficient carrier collection for scalability.The characteristics and device performance with long and short nanowires are systematically compared. A power conversion efficiency of 10.1% is achieved with a device area of 1×1 cm2 under 100 mW/cm2 of AM1.5G illumination for the hybrid solar cells employing long wires, which represents an enhancement factor of up to 36.5% compared to the metal grid counterpart. The capability of silver nanowires as flexible transparent electrodes presents a great opportunity to accelerate the mass deployment of high-efficiency hybrid silicon photovoltaics via simple and rapid soluble processes. Looking forward, the use of silicon nanowire templates in hybrid photovoltaic devices are investigated, where interface engineering via organic materials plays a critical role to mitigate the tradeoffs between light harvesting and carrier collection for future applications.

 

Registration

No registration necessary

 

Registration fee

Free