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DOI	10.1039/d0ee01655a
	A hole-transport material that also passivates perovskite surface defects for solar cells with improved efficiency and stability
	Zhao B.X.; Yao C.; Gu K.; Liu T.; Xia Y.; Loo Y.-L.
发表日期	2020
ISSN	17545692
起始页码	4334
结束页码	4343
卷号	13 期号:11
英文摘要	While typical perovskite solar cells (PSCs) with doped Spiro-OMeTAD as a hole transport material (HTM) have shown rapid increase in their power-conversion efficiencies (PCEs), their poor stability remains a big concern as the dopants and additives used with Spiro-OMeTAD have a strong tendency to diffuse into and degrade the perovskite active layer under normal operating conditions. Aiming to push forward the development of PSCs, many dopant-free small-molecular HTMs have been reported based on energetic considerations for charge transfer and criteria for charge transport. However, the PCEs of the state-of-the-art PSCs with dopant-free small-molecular HTMs are still inferior to those using doped Spiro-OMeTAD, and little attention has been paid to the interactions between the HTM and perovskite absorber in PSCs. Here, we report a facile design concept to functionalize HTMs so that they can passivate perovskite surface defects and enable perovskite active layers with lower density of surface trap states and more efficient charge transfer to the hole transport layer. As a consequence, perovskite solar cells with a functionalized HTM exhibit a champion PCE of 22.4%, the highest value for PSCs using dopant-free small molecular HTMs to date, and substantively improved operational stability under continuous illumination. With a T80 of (1617 ± 7) h for encapsulated cells tested at 30 °C in air, the PSCs containing the functionalized HTM are among the most stable PSCs using dopant-free small-molecular HTMs. The effectiveness of our strategy is demonstrated in PSCs comprising both a state-of-the-art MA-free perovskite and MAPbI, a system having more surface defects, and implies the potential generality of our strategy for a broad class of perovskite systems, to further advance highly efficient and stable solar cells. © The Royal Society of Chemistry.
英文关键词	Additives; Charge transfer; Efficiency; Perovskite; Surface defects; Encapsulated cell; Hole transport layers; Hole transport materials; Normal operating conditions; Operational stability; Power conversion efficiencies; State of the art; Surface trap-states; Perovskite solar cells; active layer; efficiency measurement; fuel cell; perovskite; solar power
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189499
作者单位	Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, United States; Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ 08544, United States
推荐引用方式 GB/T 7714	Zhao B.X.,Yao C.,Gu K.,et al. A hole-transport material that also passivates perovskite surface defects for solar cells with improved efficiency and stability[J],2020,13(11).
APA	Zhao B.X.,Yao C.,Gu K.,Liu T.,Xia Y.,&Loo Y.-L..(2020).A hole-transport material that also passivates perovskite surface defects for solar cells with improved efficiency and stability.Energy & Environmental Science,13(11).
MLA	Zhao B.X.,et al."A hole-transport material that also passivates perovskite surface defects for solar cells with improved efficiency and stability".Energy & Environmental Science 13.11(2020).