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Stretchable Hole Extraction Layer for Improved Stability in Perovskite Solar Cells
摘要： Flexibility and stretchability of solar cells are crucial factors for enhancing their real-life application for wearable devices. Although poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has been conventionally employed as a hole extraction layer (HEL) in flexible organic or perovskite solar cells, the inherent stretchability of PEDOT:PSS has yet to be convinced. Here, we report a highly stretchable and mechanically stable PEDOT:PSS-based thin film and its application on flexible perovskite solar cells. We synthesized a chemically linked copolymer, P(SS-co-TFPMA), consisting of PSS and tetrafluoropropylmethacrylate (TFPMA), followed by graft-copolymerization with poly(ethylene glycol) methyl ether methacrylate (PEGMA) to form a P(SS-co-TFPMA)-g-PEGMA dopant for the PEDOT HEL. The PEDOT:P(SS-co-TFPMA)-g-PEGMA (PEDOT:PTP) copolymer solution has excellent homogeneity and high phase stability and its developed HEL film exhibits outstanding stretching capability. After stretching of 300%, PEDOT:PTP films sustain conductivity of over 80% of its original conductivity whereas the conventional PEDOT:PSS films completely lose their conductivity after the strain of 300 %. In addition, the PEDOT:PTP incorporated flexible perovskite solar cells exhibited improved mechanical stability compared with the unassisted cells, retaining 92% of the initial power conversion efficiency after 1500 bending cycles at a 7 mm radius.
关键词： PEDOT:PTP,Stretchable,PEDOT:PSS,Hole extraction layer,Flexible,poly(ethylene glycol)methylacrylate
更新于2025-09-23 15:21:01
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Inorganic molecule-induced electron transfer complex for highly efficient organic solar cells
摘要： Interfacial engineering of electrode modification has been proved to be an effective approach for improving the power conversion efficiency (PCE) of organic solar cells (OSCs). However, compared to the advance in active layer, the study of interfacial modification is seriously lagging behind and the contribution of electrode modification to the PCE enhancement is marginalized. Herein, we synthesized a series of polynuclear metal-oxo clusters (PMCs) with gradually varied chemical composition and photoelectronic properties, by which an efficient and stable hole extraction layer was developed to enhance OSC efficiencies. The PCE of the OSC modified by PMC-4 was improved from 15.7% to 16.3% as compared to the PEDOT:PSS device. Moreover, PMC-4 can be fabricated through solution processing without any post-treatment, and the corresponding device shows improved long-term stability. As revealed for the first time, the strong oxidizing property of PMC can induce the formation of inorganic-organic electron transfer complex with a barrier-free interface for efficient hole extraction. Furthermore, experimental data and theoretical calculation results reveal that the molecular polarization of mixed-addenda PMCs can enhance the capacitance at the AIL/active layer interfaces. As a result, the mixed-addenda PMCs can be processed by blade-coating to make a large-area OSC of 1 cm2, and a certified PCE of 14.3% was achieved.
关键词： power conversion efficiency,hole extraction layer,polynuclear metal-oxo clusters,organic solar cells,interfacial engineering
更新于2025-09-23 15:19:57
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Solution processed CuSCN/perylene hole extraction layer for highly efficient and stable organic solar cells
摘要： In this work, we report a solution processed hole extraction layer (HEL) for highly efficient organic solar cells (OSCs), which is formed by CuSCN and perylene. It shows that the introduction of perylene helps to polish the interface between HEL and active layers, leading to efficient charge transport and collection, diminished recombination loss, and thereby improving the photovoltaic performance. In poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b; 4,5-b]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)]:[6,6]-phenyl C71-butyric acid methyl ester (PTB7-Th:PC71BM) based OSCs, over 9% enhancement of power conversion efficiency (PCE) is obtained in the cells using bilayer CuSCN/perylene as HEL compared with that of the reference cell using pure CuSCN as HEL. The advantage of bilayer CuSCN/perylene HEL is also confirmed in nonfullerene system. An improved PCE is also obtained after application of perylene in nonfullerene system based cell. Furthermore, superior air stability has been observed in CuSCN and CuSCN/perylene HEL based cells. The use of a bilayer CuSCN/perylene HEL proves a potential approach to obtain efficient and stable OSCs.
关键词： Hole extraction layer,Photovoltaic performance,CuSCN,Perylene,Organic solar cells
更新于2025-09-16 10:30:52