Mechanically Recoverable and Highly Efficient Perovskite Solar Cells: Investigation of Intrinsic Flexibility of Organic–Inorganic Perovskite |
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Authors: | Minwoo Park Hae Jin Kim Inyoung Jeong Jinwoo Lee Hyungsuk Lee Hae Jung Son Dae‐Eun Kim Min Jae Ko |
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Institution: | 1. Photo‐Electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, Korea;2. School of Mechanical Engineering, Yonsei University, Seoul, Korea;3. Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea;4. Green School, Korea University, Seoul, Republic of Korea;5. KU‐KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Republic of Korea |
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Abstract: | Highly efficient solar cells with sustainable performance under severe mechanical deformations are in great demand for future wearable power supply devices. In this regard, numerous studies have progressed to implement flexible architecture to high‐performance devices such as perovskite solar cells. However, the absence of suitable flexible and stretchable materials has been a great obstacle in the replacement of largely utilized transparent conducting oxides that are limited in flexibility. Here, a shape recoverable polymer, Noland Optical Adhesive 63, is utilized as a substrate of perovskite solar cell to enable complete shape recovery of the device upon sub‐millimeter bending radii. The employment of stretchable electrodes prevents mechanical damage of the perovskite layer. Before and after bending at a radius of 1 mm, power conversion efficiency (PCE) is measured to be 10.75% and 10.4%, respectively. Additionally, the shape recoverable device demonstrates a PCE of 6.07% after crumpling. The mechanical properties of all the layers are characterized by nanoindentation. Finite element analysis reveals that the outstanding flexibility of the perovskite layer enables small plastic strain distribution on the deformed device. These results clearly demonstrated that this device has great potential to be utilized in stretchable power supply applications. |
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Keywords: | flexible solar cells nanoindentation perovskite solar cells shape memory polymers stretchable electronics |
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