Multilayer graphene films as transparent electrodes for organic photovoltaic devices

• Published in: Solar energy materials and solar cells 2012, Vol.96 (1), p.281-285
• Main Authors: Choi, Yoon-Young, Kang, Seong Jun, Kim, Han-Ki, Choi, Won Mook, Na, Seok-In
• Format: Article
• Language: English
• Subjects: Applied sciences; Chemical vapor deposition; Conversion; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrical resistivity; Electrodes; Energy; Exact sciences and technology; Graphene; Indium tin oxide; ITO; Multilayers; Natural energy; Organic solar cells; Photoelectric conversion; Photovoltaic cells; Photovoltaic conversion; Solar cells; Solar cells. Photoelectrochemical cells; Solar energy; Transparent conductor
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2011.09.031

We have fabricated ITO-free organic solar cells (OSCs) based on multilayer graphene (MLG) electrodes. MLG electrodes with high transparency (∼84.2%) and low sheet resistance (∼374±3 Ω/square) were obtained on glass substrates using chemical vapor deposition and a multi-transfer process. The OSCs fabricated on MLG electrodes had an open circuit voltage of 0.52 V, a short circuit current of 6.90 mA/cm 2, a fill factor of 32.6%, and a power conversion efficiency of 1.17%. The performance of the OSCs fabricated on transparent MLG electrode was not comparable to that of OSCs fabricated on ITO electrodes; cost-effective MLG electrodes are a viable alternative to sputter-grown ITO electrodes for cost-efficient and flexible OSCs.