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High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-08-20 00:00:00 , DOI: 10.1021/acs.jpclett.8b02250
Bin Yang 1, 2 , Junsheng Chen 1, 3 , Qi Shi 3 , Zhengjun Wang 3 , Marina Gerhard 3 , Alexander Dobrovolsky 3 , Ivan G. Scheblykin 3 , Khadga Jung Karki 3 , Keli Han 1 , Tõnu Pullerits 3
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-08-20 00:00:00 , DOI: 10.1021/acs.jpclett.8b02250
Bin Yang 1, 2 , Junsheng Chen 1, 3 , Qi Shi 3 , Zhengjun Wang 3 , Marina Gerhard 3 , Alexander Dobrovolsky 3 , Ivan G. Scheblykin 3 , Khadga Jung Karki 3 , Keli Han 1 , Tõnu Pullerits 3
Affiliation
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We fabricate photodetectors based on solution-processed single CH3NH3PbBr3 microcrystals (MCs) and map the two-photon absorption (TPA) excited photocurrent (PC) with spatial resolution of 1 μm. We find that the charge carrier transport length in the MCs depends on the applied electric field, and increases from 5.7 μm for 0.02 V bias (dominated by carrier diffusion) to 23.2 μm for 2 V bias (dominated by carrier drift). Furthermore, PC shows strong spatial variations. Combining the PC mapping results with time-resolved photoluminescence microscopy, we demonstrate that the spatial distribution of PC mainly originates from the inhomogeneous distribution of trap-states across perovskite MCs. This suggests that there is still large margin for improvement of perovskite single crystal devices by better controlling of the traps.
中文翻译:
钙钛矿微孔板光探测器中两光子激发光电流的高分辨率映射
我们基于溶液处理的单个CH 3 NH 3 PbBr 3制造光电探测器微晶(MCs)并绘制了空间分辨率为1μm的双光子吸收(TPA)激发光电流(PC)。我们发现,MC中的电荷载流子传输长度取决于所施加的电场,并且从0.02 V偏置(以载流子扩散为主)的5.7μm增加到2 V偏置(以载流子漂移为主)的23.2μm。此外,PC表现出强烈的空间变化。结合PC映射结果与时间分辨光致发光显微镜,我们证明PC的空间分布主要源自钙钛矿MC的陷阱态的不均匀分布。这表明通过更好地控制陷阱,仍存在很大的改进钙钛矿单晶器件的余地。
更新日期:2018-08-20
中文翻译:
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钙钛矿微孔板光探测器中两光子激发光电流的高分辨率映射
我们基于溶液处理的单个CH 3 NH 3 PbBr 3制造光电探测器微晶(MCs)并绘制了空间分辨率为1μm的双光子吸收(TPA)激发光电流(PC)。我们发现,MC中的电荷载流子传输长度取决于所施加的电场,并且从0.02 V偏置(以载流子扩散为主)的5.7μm增加到2 V偏置(以载流子漂移为主)的23.2μm。此外,PC表现出强烈的空间变化。结合PC映射结果与时间分辨光致发光显微镜,我们证明PC的空间分布主要源自钙钛矿MC的陷阱态的不均匀分布。这表明通过更好地控制陷阱,仍存在很大的改进钙钛矿单晶器件的余地。