A VERSATILE SELF-ORGANIZATION PRINTING METHOD TO SIMPLIFY TANDEM ORGANIC PHOTOVOLTAICS WITH FOUR-LAYER STRUCTURE
Seok Kim a, Hongkyu Kang b, Soonil Hong a, Jinho Lee a, Soyeong Jeong a, Byoungwook Park a, Kwanghee Lee c
a School of Materials Science and Engineering, Gwangju Institute of Science and Technology
b Heeger Center for Advanced Materials & Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science and Technology
c School of Materials Science and Engineering, Heeger Center for Advanced Materials & Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science and Technology
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Kitakyūshū-shi, Japan, 2018 January 28th - 30th
Organizers: Shuzi Hayase, Juan Bisquert and Hiroshi Segawa
Poster, Seok Kim, 109
Publication date: 27th October 2017

Despite recent dramatic enhancements in power conversion efficiencies (PCEs) resulting in values over 10%, the manufacturing of tandem organic solar cells (OSCs) via current printing technologies is subject to tremendous challenges. Existing complicated tandem structures consisting of six or more component layers have been a major obstacle that significantly increases the complexity of printing processes and substantially sacrifices the PCE for printed devices. Here, we report an innovative printing method that simplifies the fabrication process of the tandem OSCs. By developing a new printing technique using a nanocomposite containing interfacial and photoactive materials, we successfully demonstrate a simultaneously printed bilayer of interfacial and photoactive layers achieved through vertical self-organization, resulting in tandem OSCs with only four printed layers. Moreover, by rigorously controlling the molecular weight of the interfacial materials, we improve the self-assembly characteristics of the nanocomposite and yield an efficient tandem OSC with a PCE of 9.1% achieved in printed layers.

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