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Open accessJournal ArticleDOI: 10.1016/J.ISCI.2021.102276

Synergetic surface charge transfer doping and passivation toward high efficient and stable perovskite solar cells

05 Mar 2021-iScience (Elsevier)-Vol. 24, Iss: 4, pp 102276-102276
Abstract: Summary Organic-inorganic lead halide perovskite solar cells (PSCs) have received much attention in the last few years due to the high power conversion efficiency (PCE). Generally, perovskite/charge transport layer interface and the defects at the surface and grain boundaries of perovskite film are important factors for the efficiency and stability of PSCs. Herein, we employ an extended benzopentafulvalenes compound (FDC-2-5Cl) with electron-withdrawing pentachlorophenyl group and favorable energy level as charge transfer molecule to treat the perovskite surface. The FDC-2-5Cl with pentachlorophenyl group could accept the electrons from perovskite as a p-type dopant, and passivate the surface defects. The p-type doping effect of FDC-2-5Cl on perovskite surface induced band bending at perovskite surface, which improves the hole extraction from perovskite. As a result, the PSC with FDC-2-5Cl treatment achieves a PCE of 21.16% with an enhanced open-circuit voltage (Voc) of 1.14 V and outstanding long-term stability.

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Topics: Perovskite (structure) (65%), Band bending (50%), Doping (50%)

8 results found

Open accessJournal ArticleDOI: 10.1002/ADVS.202101367
Jian He1, Jie Su1, Zhenhua Lin1, Jing Ma1  +5 moreInstitutions (2)
30 Jun 2021-Advanced Science
Abstract: All-inorganic perovskites have been intensively investigated as potential optoelectronic materials because of their excellent thermal stability, especially for CsPbI2 Br. Herein, the authors studied the effects of mixed passivation utilizing organic phenylethylammonium bromide and inorganic ionic cesium bromide (PEABr + CsBr) on the all-inorganic perovskite (CsPbI2 Br) solar cells for the first time. The treatment with different passivation mechanisms enhances the perovskite film quality, resulting in uniform surface morphology and compact film with low trap density. Besides, the passivation improves the energy level alignment, which benefits the hole extraction at the perovskite/HTL interface and drives the interface electron separation, suppressing the charge recombination and realizing a high open-circuit voltage (Voc ). Finally, the device represents a high power conversion efficiency (PCE) of 16.70%, a Voc of 1.30 V, and an excellent fill factor (FF) of 0.82. The Voc loss and high FF should be among the best values for CsPbI2 Br based devices. Furthermore, the treated devices exhibit remarkable long-term stability with only 8% PCE loss after storing in a glove box for more than 1000 h without encapsulation.

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Topics: Passivation (58%), Perovskite (structure) (56%), Thermal stability (50%)

6 Citations

Journal ArticleDOI: 10.1016/J.MTPHYS.2021.100446
Peng Zhao1, Jie Su1, Yujia Guo1, Lu Wang1  +5 moreInstitutions (1)
Abstract: Although MAPbI3 photovoltaics have gained increasing interest for space application, its low stability and radiation resistance is insurmountable. Here, we unexpectedly find a new vacancy-ordered double perovskite Cs2CrI6 to realize high-performance space solar cells and α-particle detectors through an innovative multi-scale simulation strategy based on the first-principle calculations coupling with drift-diffusion model and Monte Carlo method. Compared to the MAPbI3, Cs2CrI6 possesses more excellent stability and optical absorption, suitable band gap (1.08 eV), higher mobility (∼103 cm2/V) and lower capture cross-section. These lead to the ultra-high power conversion efficiency (PCE) for single-junction solar cells (22.4%) and monolithic all-perovskite tandem solar cells (26.6%), and excellent α-particle detectors with ultra-high charge collection efficiency (CCE = 99.3%) and mobility-lifetime product (μτh = 4.99 × 10−3 cm2V−1), which are superior to those of corresponding MAPbI3 devices. Meanwhile, the 90% of initial PCE can be remained even under the 5 × 1013 p. cm−2 fluence proton beam and several orders higher than traditional space solar cell. Moreover, the proton irradiation resistance of Cs2CrI6 α-particle detection can reach up to 1016 p. cm−2. The excellent device performance and irradiation resistance of Cs2CrI6 devices indicate the great potential application in photovoltaic cells, α-particle detectors and even their space applications.

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Topics: Solar cell (61%), Photovoltaics (59%), Photovoltaic system (56%) ... show more

3 Citations

Journal ArticleDOI: 10.1016/J.JECHEM.2021.08.021
Jing Ma1, Zhenhua Lin1, Xing Guo1, Long Zhou1  +6 moreInstitutions (2)
Abstract: Inorganic CsPbI2Br perovskite solar cells (PSCs) have a tremendous development in last few years due to the trade-off between the excellent optoelectronic properties and the relatively outstanding stability. Herein, we demonstrated a strategy of secondary crystallization (SC) for CsPbI2Br film in a facile planar n-i-p structure (ITO/ZnO-SnO2/CsPbI2Br/Spiro-OMeTAD/Ag) at low-temperature (150 °C). It is achieved through the method of post-treatment with guanidinium bromine (GABr) atop annealed CsPbI2Br film. It was found that the secondary crystallization by GABr can not only regulate the crystal growth and passivate defects, but also serve as a charge collection center to effectively collect photogenerated carriers. In addition, due to the excess Br ions in GABr, the formation of the Br-rich region at the CsPbI2Br perovskite surface can further lower the Fermi level, leading to more beneficial band alignment between the perovskite and the hole transport layer (HTL), while the phase stability was also improved. As a result, the champion cell shows a superb open-circuit voltage (Voc) of 1.31 V, a satisfactory power conversion efficiency (PCE) of 16.97% and outstanding stabilities. As far as we know, this should be one of the highest PCEs reported among all-inorganic CsPbI2Br based PSCs.

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Topics: Perovskite (structure) (55%), Crystallization (51%)

1 Citations

Open accessJournal ArticleDOI: 10.1007/S40820-021-00763-8
Jie Xu1, Jian Cui1, Shaomin Yang1, Yu Han1  +11 moreInstitutions (5)
02 Dec 2021-Nano-micro Letters
Abstract: The application of ionic liquids in perovskite has attracted wide-spread attention for its astounding performance improvement of perovskite solar cells (PSCs). However, the detailed mechanisms behind the improvement remain mysterious. Herein, a series of imidazolium-based ionic liquids (IILs) with different cations and anions is systematically investigated to elucidate the passivation mechanism of IILs on inorganic perovskites. It is found that IILs display the following advantages: (1) They form ionic bonds with Cs+ and Pb2+ cations on the surface and at the grain boundaries of perovskite films, which could effectively heal/reduce the Cs+/I- vacancies and Pb-related defects; (2) They serve as a bridge between the perovskite and the hole-transport-layer for effective charge extraction and transfer; and (3) They increase the hydrophobicity of the perovskite surface to further improve the stability of the CsPbI2Br PSCs. The combination of the above effects results in suppressed non-radiative recombination loss in CsPbI2Br PSCs and an impressive power conversion efficiency of 17.02%. Additionally, the CsPbI2Br PSCs with IILs surface modification exhibited improved ambient and light illumination stability. Our results provide guidance for an in-depth understanding of the passivation mechanism of IILs in inorganic perovskites.

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Topics: Perovskite (structure) (57%)


50 results found

Journal ArticleDOI: 10.1021/JA809598R
Abstract: Two organolead halide perovskite nanocrystals, CH3NH3PbBr3 and CH3NH3PbI3, were found to efficiently sensitize TiO2 for visible-light conversion in photoelectrochemical cells. When self-assembled on mesoporous TiO2 films, the nanocrystalline perovskites exhibit strong band-gap absorptions as semiconductors. The CH3NH3PbI3-based photocell with spectral sensitivity of up to 800 nm yielded a solar energy conversion efficiency of 3.8%. The CH3NH3PbBr3-based cell showed a high photovoltage of 0.96 V with an external quantum conversion efficiency of 65%.

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Topics: Perovskite solar cell (58%), Methylammonium halide (57%), Energy conversion efficiency (55%) ... show more

13,033 Citations

Open accessJournal ArticleDOI: 10.1126/SCIENCE.1243982
18 Oct 2013-Science
Abstract: Organic-inorganic perovskites have shown promise as high-performance absorbers in solar cells, first as a coating on a mesoporous metal oxide scaffold and more recently as a solid layer in planar heterojunction architectures. Here, we report transient absorption and photoluminescence-quenching measurements to determine the electron-hole diffusion lengths, diffusion constants, and lifetimes in mixed halide (CH3NH3PbI(3-x)Cl(x)) and triiodide (CH3NH3PbI3) perovskite absorbers. We found that the diffusion lengths are greater than 1 micrometer in the mixed halide perovskite, which is an order of magnitude greater than the absorption depth. In contrast, the triiodide absorber has electron-hole diffusion lengths of ~100 nanometers. These results justify the high efficiency of planar heterojunction perovskite solar cells and identify a critical parameter to optimize for future perovskite absorber development.

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Topics: Perovskite solar cell (63%), Perovskite (structure) (60%), Methylammonium lead halide (58%) ... show more

6,875 Citations

Journal ArticleDOI: 10.1021/NL400349B
Jun Hong Noh, Sang Hyuk Im1, Jin Hyuck Heo, Tarak Nath Mandal  +1 moreInstitutions (2)
21 Mar 2013-Nano Letters
Abstract: Chemically tuned inorganic–organic hybrid materials, based on CH3NH3(═MA)Pb(I1–xBrx)3 perovskites, have been studied using UV–vis absorption and X-ray diffraction patterns and applied to nanostructured solar cells. The band gap engineering brought about by the chemical management of MAPb(I1–xBrx)3 perovskites can be controllably tuned to cover almost the entire visible spectrum, enabling the realization of colorful solar cells. We demonstrate highly efficient solar cells exhibiting 12.3% in a power conversion efficiency of under standard AM 1.5, for the most efficient device, as a result of tunable composition for the light harvester in conjunction with a mesoporous TiO2 film and a hole conducting polymer. We believe that the works highlighted in this paper represent one step toward the realization of low-cost, high-efficiency, and long-term stability with colorful solar cells.

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Topics: Hybrid solar cell (67%), Solar energy (55%)

3,521 Citations

Open accessJournal ArticleDOI: 10.1126/SCIENCE.AAA2725
Dong Shi1, Valerio Adinolfi2, Riccardo Comin2, Mingjian Yuan2  +12 moreInstitutions (4)
30 Jan 2015-Science
Abstract: The fundamental properties and ultimate performance limits of organolead trihalide MAPbX3 (MA = CH3NH3(+); X = Br(-) or I(-)) perovskites remain obscured by extensive disorder in polycrystalline MAPbX3 films. We report an antisolvent vapor-assisted crystallization approach that enables us to create sizable crack-free MAPbX3 single crystals with volumes exceeding 100 cubic millimeters. These large single crystals enabled a detailed characterization of their optical and charge transport characteristics. We observed exceptionally low trap-state densities on the order of 10(9) to 10(10) per cubic centimeter in MAPbX3 single crystals (comparable to the best photovoltaic-quality silicon) and charge carrier diffusion lengths exceeding 10 micrometers. These results were validated with density functional theory calculations.

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Topics: Trihalide (58%), Perovskite (structure) (51%), Charge carrier (51%)

3,157 Citations

Open accessJournal ArticleDOI: 10.1002/ADMA.201305172
01 Mar 2014-Advanced Materials
Abstract: Organolead trihalide perovskites are shown to exhibit the best of both worlds: charge-carrier mobilities around 10 cm2 V−1 s−1 and low bi-molecular charge-recombination constants. The ratio of the two is found to defy the Langevin limit of kinetic charge capture by over four orders of magnitude. This mechanism causes long (micrometer) charge-pair diffusion lengths crucial for flat-heterojunction photovoltaics.

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Topics: Trihalide (60%)

2,249 Citations