A Versatile Self‐Organization Printing Method for Simplified Tandem Organic Photovoltaics |
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| Authors: | Seok Kim Hongkyu Kang Soonil Hong Jinho Lee Seongyu Lee Byoungwook Park Junghwan Kim Kwanghee Lee |
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| Affiliation: | School of Materials Science and Engineering, Department of Nanobio Materials and Electronics, Heeger Center for Advanced Materials, Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea |
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| Abstract: | 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, an innovative printing method is reported that simplifies the fabrication process of the tandem OSCs. By developing a new printing technique using a nanocomposites containing interfacial and photoactive materials, a simultaneously printed bilayer of consisting of interfacial and photoactive layers, achieved through vertical self‐organization, is successfully demonstrated, resulting in tandem OSCs with only four printed layers. Moreover, by rigorously controlling the molecular weight of the interfacial materials, the self‐assembly characteristics are improved and an efficient tandem OSC is yielded with a PCE of 9.1% achieved in printed layers. |
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| Keywords: | molecular weight dependence organic photovoltaics printing techniques tandem organic solar cells vertical self‐organization |
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