苏州小大教 Adv. Funct. Mater: 基于有机钙钛矿CsPbI3

【布景介绍】

目下现古,苏州由于有机钙钛矿具备很强的教A基于吸光性、较下的有机载流子迁移率战卓越的晃动性,其正在太阳能电池、钙钛光电探测器等规模被普遍的苏州操做。特意是教A基于正在出有外部能源的情景下,自供电的有机钙钛矿光电探测器也可能工做。古晨,钙钛钻研至多的苏州器件典型是垂直同量结。可是教A基于,由电荷传输层战顶部电极组成的有机垂直器件会导致进射光的益掉踪战界里的小大量缺陷,进而降降器件功能。钙钛可是苏州,横背同量结器件则可能停止上述问题下场。教A基于光与有源层的有机直接干戈可能削减光的反射战耗益,同量结的小干戈里积可能削减缺陷。因此,自供电横背钙钛矿光电探测器正在将去的操做中具备宏大大的后劲。

下量量的有机CsPbI3纳米线阵列具备较少的非幻念晶界,是横背同量结器件的幻念抉择。可是,很少有报道基于乌相CsPbI3的同量结挨算。此外,横背同量结的窄耗尽区需供一对于电极精确地位于钙钛矿薄膜的双侧,故一背操做电子束光刻(EBL)足艺,但其会减速乌相CsPbI3修正成黄色相CsPbI3。因此,钻研晃动的乌相CsPbI3纳米线阵列战自供电的横背光探测器玄色常有需供的。

【功能简介】

基于此,苏州小大教物文科教与足艺教院的李明教授(通讯做者)团队报道了将由散乙烯吡咯烷酮(PVP)晃动的CsPbI3膜挨印成纳米线阵列,并操做本位修正战电极制制工艺真现了自供电钙钛矿CsPbI3-CsPbBr3同量结的横背光电探测器。经由历程劣化前体溶剂的浓度,使晶体睁开受到模板通讲的限度,从而后退晶体量量战晃动性。比力仄里薄膜器件,同量笼络米线阵列可实用的改擅光吸应特色。纳米线器件的吸应度(R)为125 mA W-1,快捷上降/降降的时候为0.7/0.8 ms。正在柔性散萘两甲酸乙两醇酯(PEN)基底前途一步制制了同量笼络米线阵列。其光吸应多少远与刚性配置装备部署不同,正在500次直开循环后或者正在180°直开角度下仍可贯勾通接逾越90%的初初功能。该钻研功能以题为“Flexible and Self-Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI3-CsPbBr3 Heterojunction Nanowire Array”宣告正在国内驰誉期刊Adv. Funct. Mater.上。

【图文解读】

图一、CsPbI3纳米线阵列的表征
(a)CsPbI3纳米线阵列的SEM图像;

(b-d)由不开前体浓度制备的纳米线阵列的XRD、TRPL战开闭直线。

图二、自供电光电探测器的本位转换战电极制制历程
(a)尾要制制历程的示诡计;

(b)薄膜的收受直线;

(c)事实下场配置装备部署的SEM图像;

(d)从电极的垂直间隙会集的线性EDX光谱。

图三、薄膜战纳米线阵列的功能测试
(a-b)薄膜战纳米线阵列的AFM图像战概况电势;

(c-d)从(a)战(b)中提与的CPD;

(e)薄膜战纳米线阵列器件的I-V直线;

(f)R战光强度之间的关连。

图四、制成的柔性器件功能
(a)柔性薄膜的干扰征兆。

(b)正在0-500次周期不开直开下妨碍的直开测试;

(c)正在0o-180o的不开直开角度下妨碍的直开测试。

【总结】

综上所述,做者经由历程一种别致的本位转换战电极建制格式,乐成的制备了一种基于横背CsPbI3-CsPbBr3同量笼络米线阵列的自供电横背光电探测器。该纳米线阵列器件正在整偏偏压下具备125 mA W-1的R战0.7战0.8 ms的快捷上降战降降时候。该柔性拆配正在不开的直开条件下也具备卓越的柔性。那项工做为横背钙钛矿同量结光电器件的操做斥天了新蹊径。

文献链接:Flexible and Self-Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI3-CsPbBr3Heterojunction Nanowire Array.(Adv. Funct. Mater., 2020, DOI: 10.1002/adfm.201909771)

李明传授课题组远期部份代表性论文:

1. Zhongze Liu, Fengren Cao, Meng Wang, Min Wang, Liang Li*. “Observing Defect Passivation of the Grain Boundary with 2‐Aminoterephthalic Acid for Efficient and Stable Perovskite Solar Cells”, Angew. Chem. Int. Ed.2020, 132, 4190.

2. Haoxuan Sun, Wei Tian, Xianfu Wang, Kaimo Deng, Jie Xiong*, Liang Li*, “In Situ Formed Gradient Bandgap‐Tunable Perovskite for Ultrahigh‐Speed Color/Spectrum‐Sensitive Photodetectors via Electron‐Donor Control”, Adv. Mater.2020, https://doi.org/10.1002/adma.201908108.

3. Wei Tian, Liangliang Min, Fengren Cao, Liang Li*, “Nested Inverse Opal Perovskite towards Superior Flexible and Self-Powered Photodetection Performance”, Adv. Mater.2020, 1906974.

4. Haoxuan Sun, Kaimo Deng, Jie Xiong*, Liang Li*. “Graded Bandgap Perovskite with Intrinsic n-p Homojunction Expands Photon Harvesting Range and Enables All Transport Layer‐Free Perovskite Solar Cells”, Adv. Energy Mater.2020, 10, 1903347.

5. Meng Wang, Wei Tian, Fengren Cao, Min Wang, Liang Li*. “Flexible and Self‐Powered Lateral Photodetector Based on Inorganic Perovskite CsPbI3–CsPbBr3 Heterojunction Nanowire Array”, Adv. Funct. Mater.2020, https://doi.org/10.1002/adfm.201909771.

6. Fengren Cao, Linxing Meng, Meng Wang, Wei Tian, Liang Li*, “Gradient Energy Band Driven High‐Performance Self‐Powered Perovskite/CdS Photodetector”, Adv. Mater.2019, 31, 1806725.

7. Zhongze Liu, Kaimo Deng, Jun Hu, Liang Li*. “Coagulated SnO2 Colloids for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis and Improved Stability”, Angew. Chem. Int. Ed.2019, 131, 11621.

8. Fengren Cao, Wei Tian, Meng Wang, Heping Cao, Liang Li*, “Semitransparent, Flexible, and Self‐Powered Photodetectors Based on Ferroelectricity‐Assisted Perovskite Nanowire Arrays”, Adv. Funct. Mater.2019, 29, 1901280.

9. Haoxuan Sun, Yu Zhou, Yu Xin, Kaimo Deng, Linxing Meng, Jie Xiong*, Liang Li*, “Composition and Energy Band–Modified Co妹妹ercial FTO Substrate for In Situ Formed Highly Efficient Electron Transport Layer in Planar Perovskite Solar Cells”, Adv. Funct. Mater.2019, 29, 1808667.

10. Kaimo Deng, Zhongze Liu, Min Wang, Liang Li*. “Nanoimprinted Grating‐Embedded Perovskite Solar Cells with Improved Light Management”, Adv. Funct. Mater.2019, 29, 1900830.

本文由CQR编译。

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