4-<i>叔丁基</i>吡啶作为钙钛矿型太阳能电池中空穴传输层形态控制者的作用,Nano Letters

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4-叔丁基吡啶作为钙钛矿型太阳能电池中空穴传输层形态控制者的作用
Nano Letters ( IF 9.6 ) Pub Date : 2016-08-26 00:00:00 , DOI: 10.1021/acs.nanolett.6b02158
Shen Wang ₁ , Mahsa Sina ₁ , Pritesh Parikh ₁ , Taylor Uekert ₁ , Brian Shahbazian ₁ , Arun Devaraj ₂ , Ying Shirley Meng ₁

Affiliation

自从引入基于铅的钙钛矿和固态空穴传输层以来，用于高效，低成本光伏设备的有机-无机混合材料取得了长足的进步。尽管大多数用于钙钛矿太阳能电池（PSC）的材料都是从染料敏化太阳能电池（DSSC）引入的，但钙钛矿覆盖层的存在与单个染料分子（在DSSC中）相反，会改变各层之间的相互作用在钙钛矿太阳能电池中。4-叔假定常用于PSC中的-丁基吡啶（tBP）与DSSC相似，起电荷重组抑制剂的作用。但是，钙钛矿覆盖层的存在要求对其在PSC中的功能进行重新评估。使用TEM（透射电子显微镜），我们首先确认了tBP作为PSC中HTL形态学控制者的作用。我们的观察结果表明，tBP显着提高了HTL的均匀性，并避免了锂盐的积累。我们还通过使用FTIR（傅立叶变换红外光谱法）和APT（原子探针层析成像）研究降解途径，以研究和可视化3维与锂盐有关的水分含量。还研究了由于tBP蒸发而产生的1000 h以上的长期影响。根据我们的发现，提出了一种与HTL的形态变化相关的PSC失效机理。tBP是HTL中的形态学控制因子，在此过程中起着关键作用，因此，本研究强调了为保持PSC长期稳定性能，需要使用沸点更高的添加剂材料。

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Role of 4-tert-Butylpyridine as a Hole Transport Layer Morphological Controller in Perovskite Solar Cells

Hybrid organic–inorganic materials for high-efficiency, low-cost photovoltaic devices have seen rapid progress since the introduction of lead based perovskites and solid-state hole transport layers. Although majority of the materials used for perovskite solar cells (PSC) are introduced from dye-sensitized solar cells (DSSCs), the presence of a perovskite capping layer as opposed to a single dye molecule (in DSSCs) changes the interactions between the various layers in perovskite solar cells. 4-tert-Butylpyridine (tBP), commonly used in PSCs, is assumed to function as a charge recombination inhibitor, similar to DSSCs. However, the presence of a perovskite capping layer calls for a re-evaluation of its function in PSCs. Using TEM (transmission electron microscopy), we first confirm the role of tBP as a HTL morphology controller in PSCs. Our observations suggest that tBP significantly improves the uniformity of the HTL and avoids accumulation of Li salt. We also study degradation pathways by using FTIR (Fourier transform infrared spectroscopy) and APT (atom probe tomography) to investigate and visualize in 3-dimensions the moisture content associated with the Li salt. Long-term effects, over 1000 h, due to evaporation of tBP have also been studied. Based on our findings, a PSC failure mechanism associated with the morphological change of the HTL is proposed. tBP, the morphology controller in HTL, plays a key role in this process, and thus this study highlights the need for additive materials with higher boiling points for consistent long-term performance of PSCs.

更新日期：2016-08-26

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