The editorial department of Zhiguanggulian has sorted out the latest important progress made by domestic and foreign research teams in Professor Yang Yang's team in 2023, and summarized other applications of perovskite solar cells, perovskite light-emitting diodes, organic solar cells and perovskite materials . , today I will share with you the emerging applications of hot materials.
1. Nature: Directional nucleation of formamidine perovskite
The black phase of FAPbI3 perovskite shows great promise as an efficient photovoltaic material, but it is not favored by thermal energy at room temperature, which means that the unwelcome yellow phase is always present with it during the crystallization process . This problem makes it difficult to develop a rapid crystallization process for perovskites and develop guidelines to control the formation of black phase FAPbI .
In view of this, on June 21, 2023, Xue Jingjing of Zhejiang University & Mohammad K. Nazeeruddin of Ecole Polytechnique Fédérale de Lausanne & Yang Yang of University of California, Los Angeles & Wang Rui of Westlake University published the research results of directional nucleation of formamidine perovskite for photovoltaic power generation in Nature , using in situ monitoring of the perovskite crystallization process to report directional nucleation mechanisms, helps avoid the presence of undesirable phases and improve the performance of photovoltaic devices in different thin film processing scenarios. The resulting device has a power conversion efficiency of 25.4% (certified at 25.0%) and an impressive module certified aperture efficiency of 21.4% (27.83 cm2).
Original link: https://www.nature.com/articles/s41586-023-06208-z
2. Nat.Commun: Ultra-low non-radiative composite binary organic solar cells
Non-fullerene acceptor-based organic solar cells represent the frontier of the field, thanks to innovations in materials and morphology manipulation. The core of organic solar cell research is to suppress non-radiative recombination losses and improve performance.
Here, Professor Li Gang from Hong Kong Polytechnic/Professor Yang Yang from UCLA and others used 1,3,5-trichlorobenzene as a crystallization regulator to develop a non-monotonic intermediate state control strategy for state-of-the-art organic solar cells. This strategy optimizes the crystallization process of the film and modulates the self-organization of the blend interface in a non-monotonic manner, i.e. first enhancing and then relaxing molecular aggregation. The excessive aggregation of non-fullerene acceptors was successfully avoided and a high-efficiency organic solar cell with reduced non-radiative recombination losses was achieved. In the PM6:BTP-eC9 organic solar cell, a binary organic solar cell efficiency of 19.31% (certified 18.93%) was achieved with extremely low non-radiative recombination loss, providing great hope for future organic solar cell research.
Original link: https://www.nature.com/articles/s41467-023-37526-5
3.Nature Sustainability: Stable translucent organic photovoltaics
Translucent organic photovoltaics (OPV) are an emerging solar energy collection technology with broad application prospects, such as rooftop energy supply for environmentally friendly greenhouses. However, OPVs suffer from poor operational stability, which challenges their viability as a continuous service facility.
Here, Minhuan Wang of Dalian University of Technology, Ilhan Yavuz of Marmara University in Istanbul, Turkey, and Professor Yang Yang of UCLA reported a reducing interlayer structure for translucent OPV that can improve the operational stability of OPV under continuous solar radiation. sex. This intermediate layer effectively inhibits the generation of free radicals from the electron transport layer under sunlight and prevents the structural decomposition of the organic photoactive layer during operation. By reducing the electron-donating functional groups of the molecule, defects acting as charge carrier recombination sites are neutralized, thereby improving photovoltaic performance. The translucent OPV exhibits a conversion efficiency of 13.5% and an average visible transmittance of 21.5%, with remarkable operational stability (84.8% maintained after 1,008 hours of continuous illumination). Greenhouse experimental results show that translucent OPV roofs help improve crop survival and growth, demonstrating the significance of our approach in solving food and energy challenges.
Original link: https://www.nature.com/articles/s41893-023-01071-2
4.Nature materials: Interstitial doping suppresses ion migration
Cations with appropriate sizes to occupy interstitial sites in perovskite crystals have been widely used to suppress ion migration and improve the performance and stability of perovskite optoelectronic devices. However, this interstitial doping inevitably causes lattice microstrain, compromising the long-range order and stability of the crystal, resulting in a sacrificial trade-off.
Here, Ilhan Yavuz of Marmara University in Istanbul, Turkey, Jin-Wook Lee of Sungkyunkwan University in Suwon, South Korea, and Professor Yang Yang of UCLA revealed the obvious influence of the oxidation state of interstitial cations on the effect of inhibiting ion migration. Compared with commonly used monovalent cation dopants (such as Na+, 0.45%), a small amount of doping (0.08%) of trivalent neodymium cations (Nd3+) effectively alleviates ion migration in the perovskite lattice. By minimizing sacrificial trade-offs, the photovoltaic performance and operational stability of prototype perovskite solar cells are improved by trace-doping of Nd3+.
Original link: https://www.nature.com/articles/s41563-022-01390-3
5. JACS: Crystal plane passivation to prepare high-efficiency perovskite cells
It is crucial to understand the interaction between surface structure and passivation materials and the effects associated with surface structure modification; however, this remains an unresolved issue in the field of perovskite passivation. Seok Joon Kwon and Cheol-Woong Yang of Sungkyunkwan University and Yang Yang of the University of California, Los Angeles and others reported the surface passivation principle of high-efficiency perovskite solar cells through the surface-related passivation phenomenon.
The passivation process occurs selectively on the facets, and it is observed through various post-processing materials with different functions that the atomic arrangement of the facets determines the arrangement of the passivation layer. A profound understanding of crystal face-dependent passivation led to the discovery of 2-amidinopyridine hydroiodide as a material for uniform and efficient passivation on the (100) and (111) crystal planes.
As a result, the researchers achieved perovskite solar cells with an efficiency as high as 25.10% and enhanced stability. The concept of facet-dependent passivation can provide important clues to the unrecognized passivation principle of perovskite materials and provide new methods for enhancing the performance and stability of perovskite-based devices.
Original link: https://pubs.acs.org/doi/10.1021/jacs.3c09327
6. AM: Effect of atmospheric humidity on the repeatability of FAPbI3 perovskite
Metal halide perovskite solar cells (PSC s) are notorious for their unrepeatable stability and performance from batch to batch and laboratory to laboratory. Reproducible manufacturing of PSCs is a key requirement for market viability and practical commercialization. The irreproducibility of PSCs plagues all levels of the community; from institutional research labs, to startups, to large enterprises.
Yang Yang from the University of California, Los Angeles, Jin-Wook Lee from Sungkyunkwan University , and Carolin M. Sutter-Fella from Lawrence Berkeley National Laboratory revealed the effect of atmospheric humidity on regulating the crystallization and formation of formamidine lead triiodide (FAPbI3 ) perovskite. Stable key features.
The researchers demonstrated that humidity during processing induces profound changes in perovskite stoichiometry, thermodynamic stability, and optoelectronic quality. Almost counterintuitively, we show that the presence of humidity may be essential for replicating phase-stable and efficient FAPbI3-based PSCs.
E-mail: info@chemborun.com
Tel: +86-574-87178138 
No. 1558, Jiangnan Road,, Ningbo, Zhejiang, China (Mainland)/31
