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Physicochemical interface effect in Cu2O-ZnO heterojunction on photocurrent spectrum

机译：Cu2O-ZnO异质结对光电流谱的理化界面效应

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摘要

This study reports the effect of oxide heterojunction solar cell (HSC) arrangement on the solar photocurrent spectra and the physical correlation to the interfacial band electronic structure. Based on the p-Cu2OZnO oxide junction, two types of stack arrangements were prepared to observe the solar photocurrent spectral change: FTO/Cu2O/ZnO/Al and FTO/ZnO/Cu2O/Al structures. In the photovoltaic cell structure, FTO was utilized as the p-type electrode, Cu2O as the p-type semiconductor, ZnO for the n-type semiconductor and Al as the n-type electrode. The HSC characteristics were characterized using ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy (XPS), diode current-voltage measurements, and finally, incident photon-to-current efficiency (IPCE). As a result, the IPCE spectra of the HSC were largely affected by (1) the bandgap of the first layer semiconductor, which is the first layer receiving incidence light regardless of the bandgap energy, and (2) the interfacial electronic band offset values in each stack. Therefore, this result offers a possible mechanism for why the HSC consisting of the FTO/Cu2O/ZnO stack shows better IPCE response than the FTO/ZnO/Cu2O stack in the view of electronic band-alignment.
机译：这项研究报告了氧化物异质结太阳能电池（HSC）排列对太阳光电流光谱的影响以及与界面能带电子结构的物理相关性。基于p-Cu2O / nZnO氧化物结，准备了两种类型的堆叠结构以观察太阳光电流光谱变化：FTO / Cu2O / ZnO / Al和FTO / ZnO / Cu2O / Al结构。在光伏电池结构中，将FTO用作p型电极，将Cu2O用作p型半导体，将ZnO用于n型半导体，将Al用作n型电极。使用紫外可见光谱，X射线光电子能谱（XPS），二极管电流电压测量以及最终的入射光子电流效率（IPCE）来表征HSC特性。结果，HSC的IPCE光谱受（1）第一层半导体的带隙（无论带隙能量如何，第一层接收入射光）和（2）界面电子带偏移值的影响很大。每个堆栈。因此，从电子能带对准的角度来看，这个结果为为什么由FTO / Cu2O / ZnO叠层组成的HSC表现出比FTO / ZnO / Cu2O叠层更好的IPCE响应提供了可能的机制。

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