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On the physics of dispersive electron transport characteristics in SnO2 nanoparticle-based dye sensitized solar cells

机译：基于SnO2纳米粒子染料敏化太阳能电池的分散电子传输特性物理学

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摘要

The present study elucidates dispersive electron transport mediated by surface states in tin oxide (SnO2) nanoparticle-based dye sensitized solar cells (DSSCs). Transmission electron microscopic studies on SnO2 show a distribution of similar to 10 nm particles exhibiting (111) crystal planes with inter-planar spacing of 0.28 nm. The dispersive transport, experienced by photo-generated charge carriers in the bulk of SnO2, is observed to be imposed by trapping and detrapping processes via SnO2 surface states present close to the band edge. The DSSC exhibits 50% difference in performance observed between the forward (4%) and reverse (6%) scans due to the dispersive transport characteristics of the charge carriers in the bulk of the SnO2. The photo-generated charge carriers are captured and released by the SnO2 surface states that are close to the conduction band-edge resulting in a very significant variation; this is confirmed by the hysteresis observed in the forward and reverse scan current-voltage measurements under AM1.5 illumination. The hysteresis behavior assures that the charge carriers are accumulated in the bulk of electron acceptor due to the trapping, and released by de-trapping mediated by surface states observed during the forward and reverse scan measurements.
机译：本研究阐明了在氧化锡（SnO2）纳米粒子基染料敏化太阳能电池（DSSCs）中的表面状态介导的分散电子传输。 SnO2的透射电子显微镜研究显示出类似于（111）晶体平面的类似于10nm颗粒的分布，其平面间隔为0.28nm。色散传输，通过在本体的SnO 2的光生电荷载流子经历，观察到通过捕获和通过表面的SnO 2进程脱阱被强加指出本接近带边缘。由于SNO2中大部分电荷载体的分散传输特性，DSSC表现出前向（4％）和反向（6％）扫描之间观察到的性能差异。通过靠近导通带边缘的SnO2表面状态捕获并释放光产生的电荷载波，从而导致非常显着的变化;这通过在AM1.5照明下的前向和反向扫描电流 - 电压测量中观察到的滞后确认。滞后行为确保电荷载体由于捕获而在大量电子受体中累积，并且通过在正向和反向扫描测量期间观察到的表面状态介导的去捕获。

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