Transparent and flexible amorphous InZnAlO films grown by roll-to-roll sputtering for acidic buffer-free flexible organic solar cells |
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| Affiliation: | 1. Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin, Gyeonggi-do 446-701, Republic of Korea;2. Samsung Display, OLED R&D Center, Yongin, Gyeonggi-do 446-711, Republic of Korea;3. Professional Graduate School of Flexible and Printable Electronics, Chonbuk National University, Jeonju-si, Jeollabuk-do 561-756, Republic of Korea;4. Division of Physics and Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea;1. Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Department of Chemical & Biological Engineering, Hanbat National University, Daejeon 305-719, Republic of Korea;3. Department of Materials Science and Engineering, Jungwon University, Goesan 367-805, Republic of Korea;4. School of Mechanical Engineering, Konkuk University, Seoul 143-701, Republic of Korea;5. Department of Organic and Nano System Engineering, Konkuk University, Seoul 143-701, Republic of Korea;1. Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taiwan;2. Department of Photonics Engineering, Yuan Ze University, Taiwan;3. Department of Electro-Optical Engineering, National United University, No. 1, Lienda, Kung-Ching Li, Miaoli 36003, Taiwan;1. Department of Physics and Institute of Advanced Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China;2. Institute of Molecular Functional Materials, Department of Chemistry, and Institute of Advanced Materials, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China;3. College of Chemistry and Environmental Engineering, Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, Dongguan University of Technology, Dongguan 523808, China;4. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | We report on transparent and flexible amorphous In–Zn–Al–O (a-IZAO) films prepared by roll-to-roll (RTR) sputtering for use as anodes in acidic buffer free flexible organic solar cells (FOSCs). The presence of Zn and Al structural stabilizers in the In2O3 matrix produced a completely amorphous structure with the high optical transmittance of 89.25% and the low resistivity of 2.123 × 10?3 Ω-cm, as well as the high work function of 5.14 eV, making the a-IZAO films suitable for use as flexible anodes for FOSCs. In addition, the a-IZAO films showed no change in resistance (ΔR) during outer and inner bending fatigue tests due to their good mechanical flexibility. Relative to the power conversion efficiency (1.944%) of a PEDOT:PSS-based FOSCs, a FOSC fabricated by using an a-IZAO anode and without the use of acidic PEDOT:PSS buffer showed greater power conversion efficiency (2.509%), owing to the absence of interfacial reactions between the acidic PEDOT:PSS and the a-IZAO anode. |
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| Keywords: | Amorphous InZnAlO Anode Roll-to-roll sputtering Flexible organic solar cells PEDOT:PSS |
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