Publication date: 1st July 2014
In this work, 1000-fold bending durable perovskite solar cell is demonstrated with a high energy conversion efficiency, 12.2%, by formation of TiOx compact-electron-collection nanolayer. We emphasize here that this is the first time to realize such a high i) bending durability, and ii) energy conversion efficiency, in flexible perovskite solar cells.
Perovskite solar cells, based on state-of-the-art inorganic-organic halide perovskite materials, are one of the most promising device for realizing wearable power source, on account of its high energy conversion efficiency, and economic fabrication process such as roll-to-roll printing. Therefore, recently, the main concern of research in this field has been moved to fabricating a highly flexible device, while preserving the high efficiency. The key process to achieve such kind of highly efficient & flexible perovskite solar cells is oxide film deposition process to make compact-electron-collection layers at a low temperature.
In this regard, we report on highly efficient and bending durable perovskite solar cells on a cheap polyethylene naphthalate (PEN) substrate, with an TiOx compact-electron-collection layer that is fabricated at below 80 oC using plasma enhanced atomic layer deposition method. We observed i) extremely fast charge injection to the TiOx layer, yielding the high efficiency of 12.2%, and ii) fairly stable energy conversion efficiency up to 1 mm of bending radius, and iii) constant device performance up to 1000 bending cycles with 10 mm of bending radius.
In addition, this study demonstrates that in our device the only obstacle to enhancing the bending durability is the commercial transparent conducting oxide film (tin-doped indium oxide, in this work), evidenced by no crack formation over 1000 cycles of bending test in ITO-free devices we made. Therefore, our process is promising to achieve a perovskite solar cell close to a practical wearable power source, having higher efficiency and bending durability, by adopting newly developed transparent conducting materials, such as poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) or nanostructured metal web layers.
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