Wang Ying, Li Menglin, Fan Baobing, Wong Yeung Sum, Lo Chung Yan, Kwok Cheuk Kai Gary, Shil Sujit Kumer, Yip Hin-Lap, Jen Alex K-Y, Tsang Sai-Wing, Yu Kin Man
Department of Physics, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR 999077, China.
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR 999077, China.
ACS Appl Mater Interfaces. 2021 Sep 15;13(36):43795-43805. doi: 10.1021/acsami.1c14722. Epub 2021 Aug 31.
Due to their low-temperature deposition, high mobility (>10 cm/V·s), and electrical conductivity, amorphous ionic oxide semiconductors (AIOSs) have received much attention for their applications in flexible and/or organic electro-optical devices. Here, we report on a study of the flexibility of CdO-InO alloy thin films, deposited on a polyethylene terephthalate (PET) substrate by radio frequency magnetron sputtering at room temperature. CdInO alloys with the composition of > 0.6 are amorphous, exhibiting a high electron mobility of 40-50 cm/V·s, a low resistivity of ∼3 × 10 Ω·cm, and high transmittance over a wide spectral window of 350 to >1600 nm. The flexibility of both crystalline and amorphous CdInO films on the PET substrate was investigated by measuring their electrical resistivity after both compressive and tensile bending with a range of bending radii and repeated bending cycles. Under both compressive and tensile bending with = 16.5 mm, no significant degradation was observed for both the crystalline and amorphous films up to 300 bending cycles. For a smaller bending radius, the amorphous film shows much less electrical degradation than the crystalline films under compressive bending due to less film delamination at the bending sites. On the other hand, for a small bending radius (<16 mm), both crystalline and amorphous films degrade after repeated tensile bending, most likely due to the development of microcracks in the films. To demonstrate the application of amorphous CdInO alloy in photovoltaics, we fabricated perovskite and bulk-heterojunction organic solar cells (OSCs) on glass and flexible PET utilizing amorphous CdInO layers as transparent electrodes. The organic-inorganic hybrid perovskite solar cells (PSCs) exhibit a power conversion efficiency (PCE) of ∼11 to 12% under both front and back illumination, demonstrating good bifacial performance with bifaciality factor >90%. The OSCs fabricated on an amorphous CdInO-coated flexible PET substrate achieve a promising PCE of 12.06%. Our results strongly suggest the technological potentials of amorphous CdInO as a reliable and effective transparent conducting material for flexible and organic optoelectronic devices.
由于非晶离子氧化物半导体（AIOSs）具有低温沉积、高迁移率（>10 cm²/V·s）和导电性，它们在柔性和/或有机电光器件中的应用受到了广泛关注。在此，我们报告了一项关于通过室温射频磁控溅射沉积在聚对苯二甲酸乙二醇酯（PET）衬底上的CdO-InO合金薄膜柔韧性的研究。组成大于0.6的CdInO合金是非晶态的，表现出40 - 50 cm²/V·s的高电子迁移率、约3×10⁻³ Ω·cm的低电阻率以及在350至>1600 nm的宽光谱窗口内的高透过率。通过测量在一系列弯曲半径和重复弯曲循环下进行压缩和拉伸弯曲后的电阻率，研究了PET衬底上结晶态和非晶态CdInO薄膜的柔韧性。在16.5 mm的压缩和拉伸弯曲条件下，结晶态和非晶态薄膜在高达300次弯曲循环时均未观察到明显降解。对于较小的弯曲半径，由于弯曲部位的薄膜分层较少，非晶态薄膜在压缩弯曲下的电性能降解比结晶态薄膜小得多。另一方面，对于小弯曲半径（<16 mm），结晶态和非晶态薄膜在重复拉伸弯曲后都会降解，这很可能是由于薄膜中微裂纹的产生。为了证明非晶态CdInO合金在光伏中的应用，我们利用非晶态CdInO层作为透明电极，在玻璃和柔性PET上制备了钙钛矿和体异质结有机太阳能电池（OSCs）。有机 - 无机杂化钙钛矿太阳能电池（PSCs）在正面和背面光照下的功率转换效率（PCE）约为11%至12%，双面因子>90%，表现出良好的双面性能。在非晶态CdInO涂层的柔性PET衬底上制备的OSCs实现了12.06%的可观PCE。我们的结果有力地表明了非晶态CdInO作为一种用于柔性和有机光电器件的可靠且有效的透明导电材料的技术潜力。
