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arXiv 1902.06540physics.app-ph
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平板型超导太阳电池的漏电和表面钝化

Removing Leakage and Surface Recombination in Planar Perovskite Solar Cells

K. Tvingstedt, L. Gil-Escrig, C. Momblona, P. Rieder, D. Kiermasch, M. Sessolo, A. Baumann, H. J. Bolink, V. Dyakonov

摘要:

薄膜太阳能电池遭受各种类型的复合,其中漏电流通常在较低电压下占主导地位。在本文中,我们首先证明了平面甲基铵碘化铅钙钛矿太阳能电池中的并联损耗机制的三阶降低,通过用更好的空穴选择性聚芳胺替换常用的空穴传输层聚(3,4-亚乙基二氧噻吩):聚(苯乙烯磺酸盐)(PEDOT:PSS)。因此,这些电池在减少光照的条件下表现出优异的工作性能,我们证明了月光照射的极端情况下,仍然可以获得530 mV的开路电压。通过去除分流,我们还观察到VOC在光关闭后长达2小时后降至零。其次,在较高的照明强度下,基于PEDOT:PSS的电池中的主要损失归因于表面复合,并且也被证明通过替代地使用聚芳胺而基本上最小化。我们归因于减少分流和表面复合的聚芳胺更适合的半导体特性,相比PEDOT:PSS,有效地阻止电子在该电极处的重组。

英文摘要:

Thin-film solar cells suffer from various types of recombination, of which leakage current usually dominates at lower voltages. Herein, we demonstrate first a three-order reduction of the shunt loss mechanism in planar methylammonium lead iodide perovskite solar cells by replacing the commonly used hole transport layer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with a better hole-selective polyarylamine. As a result, these cells exhibit superior operation under reduced light conditions, which we demonstrate for the extreme case of moonlight irradiance, at which open-circuit voltages of 530 mV can still be obtained. By the shunt removal we also observe the VOC to drop to zero after as long as 2 h after the light has been switched off. Second, at higher illumination intensities the dominant losses in the PEDOT:PSS-based cell are ascribed to surface recombination and are also proven to be substantially minimized by instead employing the polyarylamine. We attribute the reduced shunt and surface recombination to the far better suited semiconductor character of the polyarylamine, compared to that of PEDOT:PSS, efficiently blocking electrons from recombining at this electrode.

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