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首页> 外文期刊>RSC Advances >Vertically aligned ZnO/ZnTe core/shell heterostructures on an AZO substrate for improved photovoltaic performance
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Vertically aligned ZnO/ZnTe core/shell heterostructures on an AZO substrate for improved photovoltaic performance

机译：在AZO基板上垂直排列的ZnO / ZnTe核/壳异质结构可改善光伏性能

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Vertically aligned ZnO/ZnTe core/shell heterostructures on an Al-doped ZnO substrate are developed for non-toxic semiconductor sensitized solar cells. Structural and morphological analysis serves as evidence of the successful synthesis of ZnO nanorods, ZnTe nanocrystals and ZnO/ZnTe heterostructures. The clearly observed quenching of photoluminescence (PL) from the heterostructure indicates efficient charge transfer occurring at the interface of ZnO and ZnTe, due to the type-II energy level alignment constructed by the two. The formation mechanism of the ZnO/ZnTe heterostructure is studied in depth via time-dependent reactions. It was found that the strain between ZnO and ZnTe modifies the band alignment at the interface of the heterostructure in a manner which depends on the growth time. Finally, sensitized solar cells based on the ZnO/ZnTe heterostructures with different ZnTe growth times were fabricated to evaluate the photovoltaic performance. By the careful control of the ZnTe growth time and as a result of the band alignment between ZnO and ZnTe, the power conversion efficiency (PCE) of the vertically aligned ZnO/ZnTe based solar cells could be improved to about 2%, along with a short-circuit photocurrent density of around 7.5 mA cm?2, a record efficiency for ZnO/ZnTe based sensitized solar cells. Notably, for the optimized system the internal quantum efficiency of the ZnO/ZnTe based solar cell approaches 100% in certain wavelengths, implying effective separation of photoexcited free carriers towards either the electrolyte or anode.
机译：Al掺杂的ZnO衬底上的垂直排列的ZnO / ZnTe核/壳异质结构被开发用于无毒半导体敏化太阳能电池。结构和形态分析是成功合成ZnO纳米棒，ZnTe纳米晶体和ZnO / ZnTe异质结构的证据。清晰观察到的从异质结构猝灭的光致发光（PL）表明，由于两者构成的II型能级排列，在ZnO和ZnTe的界面上发生了有效的电荷转移。通过时间依赖性反应深入研究了ZnO / ZnTe异质结构的形成机理。发现ZnO和ZnTe之间的应变以取决于生长时间的方式改变了异质结构界面处的能带排列。最后，基于具有不同ZnTe生长时间的ZnO / ZnTe异质结构，制备了敏化太阳能电池，以评估其光伏性能。通过仔细控制ZnTe的生长时间以及ZnO和ZnTe之间的能带对准，可以将垂直对准的ZnO / ZnTe基太阳能电池的功率转换效率（PCE）提高到大约2％。短路光电流密度约为7.5 mA cm ？2 ，这是ZnO / ZnTe基敏化太阳能电池的创纪录效率。值得注意的是，对于优化的系统，基于ZnO / ZnTe的太阳能电池的内部量子效率在某些波长下接近100％，这意味着光激发自由载流子朝着电解质或阳极的有效分离。

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