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Improved Eco-Friendly Photovoltaics Based on Stabilized AgBiS2 Nanocrystal Inks
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-11-20 , DOI: 10.1021/acs.chemmater.0c03126 Sung Yong Bae 1, 2 , Jae Taek Oh 2 , Jin Young Park 3 , Su Ryong Ha 2 , Jongmin Choi 3 , Hyosung Choi 2 , Younghoon Kim 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-11-20 , DOI: 10.1021/acs.chemmater.0c03126 Sung Yong Bae 1, 2 , Jae Taek Oh 2 , Jin Young Park 3 , Su Ryong Ha 2 , Jongmin Choi 3 , Hyosung Choi 2 , Younghoon Kim 1
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AgBiS2 nanocrystals (NCs) have emerged as attractive absorbers in eco-friendly photovoltaics because of their nontoxic components and high absorption coefficient. Native long-chain ligands of AgBiS2 NCs should be replaced with short-chain ligands for their photovoltaics; however, conventional approaches have been performed using solid-state ligand exchange (SSLE), resulting in inhomogeneous NC aggregation, broad bandtail, large trap density, and resultantly low open-circuit voltage (VOC) in devices. Herein, we first report that long-chain ligands of AgBiS2 NCs are replaced with halometallate-based short ligands via solution-phase ligand exchange (SPLE). AgI and BiI3 are used as halometallate sources, and we find that colloidally stable, highly concentrated AgBiS2 NC inks in polar solvents are prepared via SPLE using AgI-based halometallates, enabling one-step-deposition suitable for roll-to-roll process. This leads to higher degree of ligand exchange, sharper bandtail, lower trap density, and resultantly higher VOC in devices compared to conventional SSLE. We also first demonstrate that the photovoltaic performance can be improved by introducing ethanedithiol-exchanged AgBiS2 NCs on SPLE-prepared AgBiS2 NC solids because of favorable band alignment and extended depletion width. Thus, this enables improving device performance up to a power conversion efficiency of 4.08% with the highest VOC of 0.55 V among the AgBiS2 NC photovoltaics reported so far.
中文翻译：
基于稳定的AgBiS 2纳米晶体油墨的改进的环保型光伏电池
AgBiS 2纳米晶体（NCs）因其无毒成分和高吸收系数而在环保型光伏中成为有吸引力的吸收剂。AgBiS 2 NCs的天然长链配体应被光伏的短链配体取代；然而，常规的方法已被使用固态配位体交换（SSLE），导致不均匀的NC聚合，宽带尾，大陷阱密度，并且最终低开路电压（执行V OC在设备）。在这里，我们首先报道通过溶液相配体交换（SPLE）将AgBiS 2 NCs的长链配体替换为基于卤化金属盐的短配体。AgI和BiI 3用作卤代金属盐的来源，我们发现在极性溶剂中胶体稳定，高浓度的AgBiS 2 NC油墨是使用基于AgI的卤代金属盐通过SPLE制备的，从而使一步沉积适用于卷对卷工艺。与传统的SSLE相比，这导致更高的配体交换程度，更尖的带尾，更低的陷阱密度，以及由此导致的设备中更高的V OC。我们还首先证明，通过在SPLE制备的AgBiS 2上引入乙二硫醇交换的AgBiS 2 NC可以改善光伏性能。NC固体具有良好的能带排列和扩展的耗尽宽度。因此，这使得迄今报道的AgBiS 2 NC光伏器件中的器件转换性能最高可达到4.08％的功率转换效率，而最高的V OC为0.55V 。
更新日期：2020-12-08
中文翻译：
基于稳定的AgBiS 2纳米晶体油墨的改进的环保型光伏电池
AgBiS 2纳米晶体（NCs）因其无毒成分和高吸收系数而在环保型光伏中成为有吸引力的吸收剂。AgBiS 2 NCs的天然长链配体应被光伏的短链配体取代；然而，常规的方法已被使用固态配位体交换（SSLE），导致不均匀的NC聚合，宽带尾，大陷阱密度，并且最终低开路电压（执行V OC在设备）。在这里，我们首先报道通过溶液相配体交换（SPLE）将AgBiS 2 NCs的长链配体替换为基于卤化金属盐的短配体。AgI和BiI 3用作卤代金属盐的来源，我们发现在极性溶剂中胶体稳定，高浓度的AgBiS 2 NC油墨是使用基于AgI的卤代金属盐通过SPLE制备的，从而使一步沉积适用于卷对卷工艺。与传统的SSLE相比，这导致更高的配体交换程度，更尖的带尾，更低的陷阱密度，以及由此导致的设备中更高的V OC。我们还首先证明，通过在SPLE制备的AgBiS 2上引入乙二硫醇交换的AgBiS 2 NC可以改善光伏性能。NC固体具有良好的能带排列和扩展的耗尽宽度。因此，这使得迄今报道的AgBiS 2 NC光伏器件中的器件转换性能最高可达到4.08％的功率转换效率，而最高的V OC为0.55V 。
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