RSC Advances
·
2018
·Vol. 8
·期 17
·9409-9413
·
IF 2.936
Xiaoyu Gu,Yang Li,Yanfei Mu,Min Zhang,Tongbu Lu,Peng Wang
Chemical doping is a viable tactic to improve the charge transporting properties of organic semiconductors in efficient perovskite solar cells. In this paper, we first employ the low-cost inorganic salt FeCl3 as a chemical dopant to replace the traditional expensive cobalt complex for the oxidization of 2,2′,7,7′-tetrakis(N,N-p-dimethoxyphenylamino)-9,9′-spirobifluorene (Spiro-OMeTAD), a typical organic hole-transporter. Based on the joint measurements of electron absorption spectra, cyclic voltammetry, and the hole-only device, we reveal that FeCl3 can effectively oxidize Spiro-OMeTAD and improve the hole transporting properties of Spiro-OMeTAD. Through carefully optimizing the dopant concentration, solar cells with 80% FeCl3 doped Spiro-OMeTAD achieve over 17% power conversion efficiency based on a triple cation perovskite photoactive layer, which is comparable to that of devices with a classical cobalt complex dopant. Our work demonstrates the potential of using FeCl3 as a low-cost chemical dopant for hole-transporting materials in perovskite solar cells.
研究领域:
材料科学
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光伏技术
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有机半导体
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能源材料
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 32
·2201259
·
IF 6.389
Wenjing Hou,Yuting Ma,Jin Kang,Yaoming Xiao,Gaoyi Han
Lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) doped 2,2′,7,7′ -tetrakis( N , N -di-p-methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD) is employed as one of the most common hole transport layer. However, the Li + in Li-TFSI is easy to migrate from Spiro-OMeTAD to perovskite and SnO 2 , left the voids/pinholes in perovskite film to accelerate the invasion of oxygen and moisture, and lead to the device degradation. Here, the 1-butyl-3-methyl imidazolium phosphate dibutyl ester ([Bmim] + [DBP] − ) ionic liquid (IL) is prepared and used to modify the perovskite/Spiro-OMeTAD interface in the perovskite solar cells. The coordination interaction between P O in [Bmim] + [DBP] − IL and Pb 2+ can improve the morphology of perovskite film by passivating the uncoordinated Pb 2+ defects. The interaction between P O and Li + can suppress the undesired Li + migration. The regulated energy level assignment and ion nature of [Bmim] + [DBP] − IL can accelerate the carrier extraction at perovskite/Spiro-OMeTAD interface. The device based on the [Bmim] + [DBP] − IL interface modification yields a highly efficient photoelectric conversion efficiency of 21.16% and improved stability, outperforming that of control (19.31%) devices under the illumination of 100 mW cm −2 (AM 1.5 G).
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Ziqiu Ren,Na Wang,Menghua Zhu,Xin Li,Jingyao Qi
The simple assembling process and lower manufacturing cost are crucial for wide application of perovskite solar cells. In this work, we report an efficient interface passivation strategy for preparing high-performance planar perovskite solar cells, which does not require well-controlled moisture and oxygen atmosphere. A NH 4 F solution-based additive is introduced to passivated TiO 2 electron transfer layer, which offers reduction of oxygen-induced defects and residual surface hydroxyl groups , and lower trap state level. Using a typical planar structure of FTO/NH 4 F-TiO 2 /CH 3 NH 3 PbI 3 /Spiro-OMeTAD/Au, the champion device achieves a power conversion efficiency of 15.61%. After 28-day durability test, the device with NH 4 F-treated TiO 2 storing in air without any encapsulation exhibits a little efficiency loss (<10%). Our work demonstrates a generic approach to develop air-processed efficient planar perovskite solar cells by interface engineering for future commercialization.
研究领域:
材料科学
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太阳能
·
电气工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 42
·22592-22604
·
IF 14.511
Yanjing Rong,Mengqi Jin,Qing Du,Zhitao Shen,Yan Feng,Mengxin Wang,Fumin Li,Rong Liu,Huilin Li,Chong Chen
The lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI)-doped spiro-OMeTAD hole transport layer (HTL) suffers from poor ambient long-term conductivity, detrimental ion migration, and inability to passivate perovskite defects at the perovskite/HTL interface, which seriously hinders obtaining efficient and stable perovskite solar cells (PSCs). Here, to address all these issues, a multifunctional NiO quantum dot (QD)-modified multi-walled carbon nanotube (MWCNT:NiO) additive is added to spiro-OMeTAD. By virtue of the high conductivity, hydrophobicity and anchoring effect of MWCNT:NiO on Li-TFSI through Li-O chemical bonds, the ambient long-term conductivity, restricting Li+ ion migration and anti-deliquescence of the doped HTL are effectively improved. Meanwhile, better energetic alignment, reduced interfacial defects and the loss of organic FA+/MA+ cations at the perovskite/HTL interface are achieved due to the added MWCNT:NiO. Consequently, the optimized MWCNT:NiO-based PSC exhibits an impressive PCE (22.73%) as well as a pronounced stability for over 1200 h under ambient conditions without encapsulation (room temperature, 30–50% relative humidity). These results demonstrate that the incorporation of such a multifunctional MWCNT:NiO material provides a promising strategy to combine interface engineering and HTL optimization, which is conductive to the realization of efficient and stable PSCs as well as other perovskite-based electronics.
研究领域:
材料科学
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能源技术
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界面工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2017
·Vol. 6
·期 4
·752-758
·
IF 2.789
Weihan Wang,Xichuan Yang,Jiajia Li,Haoxin Wang,Jincheng An,Li Zhang,Xiao Jiang,Ze Yu,Licheng Sun
As a champion hole-transporting material (HTM), 2,2′7,7′-tetrakis-( N , N -di- p -methoxyphenylamine)-9,9′-spirobifluorene (Spiro-OMeTAD) has been widely used in solid-state dye-sensitized solar cells (ssDSCs). Owing to the low conductivity of Spiro-OMeTAD, a chemical doping strategy is commonly used to enhance its hole-transporting properties. In this study, we report a strong electron acceptor, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as an additive for Spiro-OMeTAD along with its application in ssDSCs. We show that the conductivity of Spiro-OMeTAD increases from 5.31×10 −5 to 2.22×10 −4 S cm upon the addition of 0.04 % DDQ, and the power conversion efficiency (PCE) of the ssDSCs also increases. By utilizing a donor–π–acceptor sensitizer with a high coefficient and an HTM with an optimized doping ratio, we were able to achieve a high PCE of 6.37 % for the ssDSCs under 100 mW cm −2 AM1.5G simulated illumination, in comparison to the PCE of the pristine device, which was only 3.50 %. An increase in the application of benzoquinone-based materials for organic electronics is expected, especially for solar-cell applications.
研究领域:
材料科学
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太阳能
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2017
·Vol. 29
·期 39
·1701221
·
IF 19.791
Bo Li,Yanan Zhang,Luyuan Zhang,Longwei Yin
Despite great progress in the photovoltaic conversion efficiency (PCE) of inorganic–organic hybrid perovskite solar cells (PSCs), the large-scale application of PSCs still faces serious challenges due to the poor-stability and high-cost of the spiro-OMeTAD hole transport layer (HTL). It is of great fundamental importance to rationally address the issues of hole extraction and transfer arising from HTL-free PSCs. Herein, a brand-new PSC architecture is designed by introducing multigraded-heterojunction (GHJ) inorganic perovskite CsPbBr x I 3− x layers as an efficient HTL. The grade adjustment can be achieved by precisely tuning the halide proportion and distribution in the CsPbBr x I 3− x film to reach an optimal energy alignment of the valance and conduction band between MAPbI 3 and CsPbBr x I 3− x . The CsPbBr x I 3− x GHJ as an efficient HTL can induce an electric field where a valance/conduction band edge is leveraged to bend at the heterojunction interface, boosting the interfacial electron–hole splitting and photoelectron extraction. The GHJ architecture enhances the hole extraction and conduction efficiency from the MAPbI 3 to the counter electrode, decreases the recombination loss during the hole transfer, and benefits in increasing the open-circuit voltage. The optimized HTL-free PCS based on the GHJ architecture demonstrates an outstanding thermal stability and a significantly improved PCE of 11.33%, nearly 40% increase compared with 8.16% for pure HTL-free devices.
研究领域:
光伏学
·
材料科学
·
半导体物理
·
可再生能源
✓ 已验证
DOI
高影响因子
Joule
·
2025
·
IF 35.4
Hao Huang,Zhineng Lan,Yingying Yang,Huilin Yan,Meng Wan,Yi Lu,Shujie Qu,Tongtong Jiang,Changxu Sun,Benyu Liu,Peng Cui,Meicheng Li
The conventional doping method of organic semiconductors (commonly including lithium bis(trifluoromethane)sulfonimide [LiTFSI]) served as hole transport layers in perovskite solar cells (PSCs) suffers from a complex, time-consuming oxidation process, detrimentally impacting device stability. Herein, we propose a novel electrolysis doping strategy to modulate organic semiconductors, enabling controllable doping and effective Li⁺ removal. This electrolysis doping exploits holes with tunable oxidizing capabilities to oxidize organic semiconductors into ion radicals at the surface of the anode electrode, which exhibits a high reproducibility and a universal application on different organic semiconductors. Simultaneously, Li⁺ ions can be reduced to Li atoms at the surface of the cathode electrode, thus removing stability-damaging residual Li + . Accordingly, the regular PSCs using electrolyzed 2,2',7,7'-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (Spiro) achieve a power conversion efficiency (PCE) of 26.16%, and the inverted-structured PSCs using electrolyzed poly[bis(4-phenyl) (2,4,6-trimethylphenyl)amine (PTAA) achieve a PCE of 25.57% with satisfying stability by maintaining 91% of initial efficiency after operating for 1,400 h under continuous one-sun illumination.
研究领域:
光伏技术
·
材料科学
·
半导体化学
·
能源材料
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Linsheng Huang,Xiaowen Zhou,Ranyun Wu,Changchang Shi,Rui Xue,Jifei Zou,Chao Xu,Jinling Zhao,Wei Zeng
A facile two-dimensional Pb-based metal-organic framework in hexagon sheet structure is developed, and an oriented haloing effect of framework is further demonstrated when it is composited with organic Spiro-OMeTAD layer based on experimental and model analysis. With the haloing effect, the composited layer shows the smoother surface, higher hydrophobicity and upshifted energy levels and electrical interfaces, in comparison to a pure Spiro-OMeTAD layer. When the composite layer is used as hole transfer layer in perovskite solar cells , the cell reveals the higher power conversion efficiency and moisture-resistance feather. The average efficiency of cell with the composite layer is 13.17%, which is 25% larger than that with pure Spiro-OMeTAD layer, and the cell can remain 54% efficiency of initial value even after 9 days in an environment of 30% relative humidity , in contrast, the efficiency of cell with pure Spiro-OMeTAD layer decays to 28% of initial value just after 7 days.
研究领域:
材料科学
·
太阳能技术
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）