Min Misook, Hossain Ridwan F, Adhikari Nirmal, Kaul Anupama B
Department of Materials Science and Engineering, PACCAR Technology Institute, University of North Texas, Denton, Texas 76203, United States.
Department of Electrical Engineering, University of North Texas, Denton, Texas 76203, United States.
ACS Appl Mater Interfaces. 2020 Mar 4;12(9):10809-10819. doi: 10.1021/acsami.9b21053. Epub 2020 Feb 18.
The synthesis of solution-processed two-dimensional (2D) layered organohalide (CH(CH)NH)(CHNH)PbI ( = 2, 3, and 4) perovskites is presented, where inkjet printing was used to fabricate heterostructure flexible photodetector (PD) devices on polyimide (PI) substrates. Inks for the = 4 formulation were developed to inkjet-print PD devices that were photoresponsive to broadband incoming radiation in the visible regime, where the peak photoresponsivity was calculated to be ∼0.17 A/W, which is higher compared to prior reports, while the detectivity was measured to be ∼3.7 × 10 Jones at a low light intensity ≈ 0.6 mW/cm. The ON/OFF ratio was also high (∼2.3 × 10), while the response time τ on the rising and falling edges was measured to be τ ≈ 24 ms and τ ≈ 65 ms, respectively. Our strain-dependent measurements, conducted here for the first time for inkjet-printed perovskite PDs, revealed that the decreased by only ∼27% with bending (radius of curvature of ∼0.262 cm). This work demonstrates the tremendous potential of the inkjet-printed, composition-tunable, organohalide 2D perovskite heterostructures for high-performance PDs, where the techniques are readily translatable toward flexible solar cell platforms as well.
本文介绍了溶液法制备的二维（2D）层状有机卤化物（CH(CH)NH)(CHNH)PbI（n = 2、3和4）钙钛矿的合成，其中采用喷墨打印在聚酰亚胺（PI）衬底上制备异质结构柔性光电探测器（PD）器件。针对n = 4配方开发了油墨，用于喷墨打印对可见光范围内的宽带入射辐射有光响应的PD器件，其峰值光响应率计算约为0.17 A/W，与先前报道相比更高，而在低光强I≈0.6 mW/cm下测得的探测率约为3.7×10琼斯。开/关比也很高（约2.3×10），而上升和下降边缘的响应时间τ分别测得约为τ≈24 ms和τ≈65 ms。我们首次对喷墨打印的钙钛矿PD进行了应变相关测量，结果表明，弯曲（曲率半径约为0.262 cm）时响应率仅下降约27%。这项工作展示了喷墨打印、成分可调的有机卤化物二维钙钛矿异质结构在高性能PD方面的巨大潜力，这些技术也很容易应用于柔性太阳能电池平台。
