| 1. |
- Wu, Tai, et al.
(författare)
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Highly stable perovskite solar cells with a novel Ni-based metal organic complex as dopant-free hole-transporting material
- 2022
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Ingår i: Journal of Energy Challenges and Mechanics. - : Elsevier BV. - 2056-9386. ; 65, s. 312-318
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Tidskriftsartikel (refereegranskat)abstract
- Hole-transporting material (HTM) plays a paramount role in enhancing the photovltaic performance of perovskite solar cells (PSCs). Currently, the vast majority of these HTMs employed in PSCs are organic small molecules and polymers, yet the use of organic metal complexes in PSCs applications remains less explored. To date, most of reported HTMs require additional chemical additives (e.g. Li-TFSI, t-TBP) towards high performance, however, the introduction of additives decrease the PSCs device stability. Herein, an organic metal complex (Ni-TPA) is first developed as a dopant-free HTM applied in PSCs for its facile synthesis and efficient hole extract/transfer ability. Consequently, the dopant-free Ni-TPAbased device achieves a champion efficiency of 17.89%, which is superior to that of pristine SpiroOMeTAD (14.25%). Furthermore, we introduce a double HTM layer with a graded energy bandgap containing a Ni-TPA layer and a CuSCN layer into PSCs, the non-encapsulated PSCs based on the Ni-TPA/ CuSCN layers affords impressive efficiency up to 20.39% and maintains 96% of the initial PCE after 1000 h at a relative humidity around 40%. The results have demonstrated that metal organic complexes represent a great promise for designing new dopant-free HTMs towards highly stable PSCs.
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| 2. |
- Zhao, Guo-Hua, et al.
(författare)
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New Beta-type Ti-Fe-Sn-Nb alloys with superior mechanical strength
- 2017
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Ingår i: Materials Science & Engineering. - : Elsevier. - 0921-5093 .- 1873-4936. ; 705, s. 348-351
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Tidskriftsartikel (refereegranskat)abstract
- Ti-Fe-Sn-Nb alloys comprised of single beta-Ti phase were developed showing excellent mechanical strength and superior plasticity. The alloys exhibited increased yield strength as a function of Fe content, where the Ti80Fe14Sn3Nb3 alloy presented the highest yield stress (1.88 GPa) comparable to that of Ti-based nanocrystalline alloys. Moreover, a significant strain-hardening (520 MPa) was achieved along with the plastic deformation. The excellent mechanical strength was enhanced by the supersaturated beta-Ti and the high density of lattice defects that restrict the dislocation motion.
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| 3. |
- Zhao, Rongjun, et al.
(författare)
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Amino-capped zinc oxide modified tin oxide electron transport layer for efficient perovskite solar cells
- 2021
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Ingår i: Cell Reports Physical Science. - : Elsevier BV. - 2666-3864. ; 2:10
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Tidskriftsartikel (refereegranskat)abstract
- Electron transport layer (ETL)/perovskite interface passivation is particularly challenging because of the use of polar solvents (e.g., DMF) for perovskite solution deposition, which usually destroy the bottom as-formed defect passivation layers. Herein, a novel multi-functional composite ETL, NH2-ZnO@SnO2, is prepared by mixing amino-capped ZnO (NH2-ZnO) nanocrystals (NCs) with SnO2 nanoparticles. The best-performing PSCs on the basis of NH2-ZnO@SnO2 achieve efficiency of 22.52%, which is significantly higher than that of the pristine SnO2 counterpart (18.45%) The enhanced performance of the NH2-ZnO@SnO2 ETL can be attributed to higher electron extraction capacity, better energy-level alignment with perovskite material, and more efficient carrier transport in device. Most important, the NH2 groups on the surface of ZnO NCs can effectively passivate the under-coordinated Pb2+ ions from perovskite films, thus reducing charge recombination at ETL/perovskite interface. The results suggest that NH2-ZnO NCs@SnO2 composite is a promising ETL for improving the performance of PSCs.
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