Tingyan Huang, Yu Zhang, Jia Sun, Yinsheng Gu, Fang Wang, Ying-Wei Lu and Paifeng Luo*,
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引用次数: 0
Abstract
In recent years, there has been some interest in the use of chemical vapor deposition (CVD) for the fabrication of perovskite solar cells (PSCs) due to its satisfactory film-quality, high controllability and consistency, low equipment cost, and easy industrial scale-up. In this paper, the mixed-cation MAxFA1–xPbI3–yBry perovskite light absorbing films were first deposited via a lead bromide (PbBr2) precursor doped CVD process, and the effect of bromine content on its material phase composition, film morphology, optical band gap, device photovoltaic characteristic, charge recombination, and carrier transport property were systematically studied. The experimental results show that introducing an appropriate PbBr2 doping amount can inhibit the formation of undesirable nonphotoactive γ phase, which enhances the crystallization ability, increases the grain size and material band gap of perovskite films, and then suppresses the carrier recombination, reduces the contact resistance, and facilitates the carrier extraction and transport at the interface. This ultimately leads to an improvement in the power conversion efficiency (PCE) and stability of the PSCs. Consequently, the optimized MAxFA1–xPbI3–yBry PSCs with 0.05 M PbBr2 doping achieve an impressive PCE of 17.94%, which is significantly higher than that of the undoped devices (16.69%) and reaches the high level of PSCs with a hybrid chemical vapor deposition (HCVD) method.
近年来,化学气相沉积技术(CVD)因其薄膜质量好、可控性和一致性好、设备成本低、易于工业规模化生产等优点,引起了人们对钙钛矿太阳能电池(PSCs)的广泛关注。本文首先采用溴化铅(PbBr2)前驱体掺杂CVD工艺沉积了混合阳离子MAxFA1-xPbI3-yBry钙钛矿吸光膜,系统研究了溴含量对其材料相组成、膜形态、光学带隙、器件光伏特性、电荷复合和载流子输运性能的影响。实验结果表明,引入适当的PbBr2掺杂量可以抑制不良非光活性γ相的形成,从而增强钙钛矿薄膜的结晶能力,增大其晶粒尺寸和材料带隙,进而抑制载流子复合,降低接触电阻,有利于载流子在界面处的提取和输运。这最终导致了电源转换效率(PCE)和稳定性的提高。结果表明,当掺杂0.05 M PbBr2时,优化后的MAxFA1-xPbI3-yBry PSCs的PCE达到了17.94%,显著高于未掺杂的PCE(16.69%),并且通过混合化学气相沉积(HCVD)方法达到了较高的PSCs水平。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.