ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Meiqin Xiao,Ting Xiang,Dohyung Kim,Miaosheng Wang,Wei Zhang,Mahshid Ahmadi,Ting Li,Xiaoyan Wu,Long Xu,Ping Chen
The multiple quantum well structure of a quasi-two-dimensional (quasi-2D) perovskite leads to nonradiative Auger recombination (AR). This is due to high local carrier density in recombination centers, although the radiative recombination is improved by efficient energy transfer. In this study, we suppress the AR by introducing phenethylammonium acetate (PEAAc) into the quasi-2D PEA2Csn–1PbnBr3n+1 perovskite. The recombination centers of n ≥ 4 phases can be promoted because the COO– preferentially coordinates with Pb2+, inhibiting the fast formation of n = 1, 2, 3 phases with phenethylammonium anion (PEA+). Thus, the AR is suppressed due to the lower density of local charge carriers. To balance the AR suppression and decreasing binding energy in promoting the n ≥ 4 phases, the PEAAc:PEABr molar ratios are adjusted. At the optimal molar ratio, perovskite light-emitting diodes (PeLEDs) with a maximum luminescence of ∼29942 cd m–2 and a maximum external quantum efficiency of ∼20.2% are achieved. These results confirm the most efficient PeLEDs based on PEA2Csn–1PbnBr3n+1 without passivation. Moreover, the efficiency roll off is significantly mitigated with a high threshold of over 3.51 mA/cm2. This study develops high-efficiency PeLEDs with a low efficiency rolloff.
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ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Chenhui Duan,Zihui Liang,Jinguo Cao,Bowen Jin,Yidong Ming,Shimin Wang,Binghe Ma,Tao Ye,Congcong Wu
Formamidinium (FA)-based perovskites remained state-of-the-art in the field of perovskite solar cells (PSCs) owing to the exceptional absorption and carrier transport properties, while the transition from photoactive (α-) to photoinactive (δ-FAPbI3) phase is the impediment that causes performance degradation and thus limits the deployment of FA-based PSCs. The unfavorable phase transition originates from tensile strain in the FAPbI3 crystal lattice, which undergoes structural reorganization for lattice strain balancing. In this work, we found that the ionic liquid (IL) could be used as the strain coordinator to balance the lattice strain for stability improvement of FAPbI3 perovskite. We theoretically studied the electronic coupling between IL and FAPbI3 and unraveled the originality of the IL-induced compressive strain. The strain-relaxed α-FAPbI3 by IL showed robust stability against environmental factors, which can withstand ambient aging for 40 days without any phase transition or decomposition. Moreover, the strain-relaxed perovskite films showed a lower trap density and resulted in conversion efficiency improvement from 18.27 to 19.88%. Based on this novel strain engineering strategy, the unencapsulated PSCs maintained 90% of their initial efficiency under ambient-air aging for 50 days.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Hanyu Wang,Wenjing Zou,Yukun Ouyang,Hu Luo,Xingchong Liu,Haimin Li,Yue Lei,Yafei Ni,Yu Fu,Ding Zheng
The uncoordinated Pb 2+ and X - vacancy defects caused by the uncontrollable crystallization process are detrimental to the efficiency and stability of perovskite solar cells (PSCs). Herein, a multifunctional ionic liquid 1-butyl-3-methylimidazolium hexafluoroan (BMIMSbF 6 ) is introduced into perovskite to form an intermediate phase to induce crystal-oriented growth and passivate intrinsic defects. The results demonstrate that PbI 2 ·BMIMSbF 6 intermediate phase can delay the crystallization rate through molecular exchange and induce the crystal-oriented growth of perovskites. Moreover, by passivating uncoordinated Pb 2+ and X - vacancy defects, BMIMSbF 6 promotes the grain coarsening of perovskite and inhibits the grain boundary migration with an Urbach energy decreased by 10 meV. As a result, the PSCs with the BMIMSbF 6 additive achieves a champion power conversion efficiency (PCE) of 22.03% and improved long-term stability. In addition to comprehensively controlling the growth of perovskite, the chemically stable BMIMSbF 6 could prevent water infiltration to protect the perovskite and enhance its humidity stability. Thus, the PSCs with BMIMSbF 6 additive maintains 85% of its initial PCE after aging at 45% relative humidity for 500 h. This work highlights the multifunctional roles of BMIMSbF 6 to induce crystal-oriented growth, passivate intrinsic defects, and enhance humidity stability to form efficient and stable PSCs.
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JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Xueyan Shan,Shimao Wang,Mengyu Fu,Xiao Zhao,Toru Aoki,Volodymyr Gnatyuk,Zanhong Deng,Ruhua Tao,Xiaodong Fang,Gang Meng
Precisely controlling the amount and location of PbI 2 in a lead halide perovskite light absorption layer is crucial for improving the performance of perovskite solar cells (PSCs) by utilizing the passivation effect of PbI 2 . Based on the high absorption coefficient of perovskite materials and the resulting extremely shallow UV penetration depth, a non-contact approach of the precise preparation of a PbI 2 passivation layer based on excimer laser irradiation (ELI) is proposed. 248 nm KrF excimer laser is adopted to irradiate the surface of [(FAPbI 3 ) 0.87 (MAPbBr 3 ) 0.13 ] 0.92 [CsPbI 3 ] 0.08 film, and a PbI 2 passivation layer could be obtained on the surface of the triple cation perovskite film through the partial decomposition of the surface layer of perovskite films induced by ELI process. And then, the average power conversion efficiency of the PSCs has been increased obviously from 17.82% to 20.68%. This non-contact photonic approach successfully breaks through the bottleneck of precisely preparing PbI 2 passivation layer and is expected to contribute to the further development of perovskite based devices.
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Advanced Science
·
2022
·Vol. 9
·期 33
·2204138
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IF 17.521
Cuiling Zhang,Chong Liu,Yanyan Gao,Shusheng Zhu,Fang Chen,Boyuan Huang,Yi Xie,Yaqing Liu,Mengen Ma,Zhen Wang,Shaohang Wu,Ruud E. I. Schropp,Yaohua Mai
Indoor photovoltaics (IPVs) are expected to power the Internet of Things ecosystem, which is attracting ever-increasing attention as part of the rapidly developing distributed communications and electronics technology. The power conversion efficiency of IPVs strongly depends on the match between typical indoor light spectra and the band gap of the light absorbing layer. Therefore, band-gap tunable materials, such as metal-halide perovskites, are specifically promising candidates for approaching the indoor illumination efficiency limit of ∼56%. However, perovskite materials with ideal band gap for indoor application generally contain high bromine (Br) contents, causing inferior open-circuit voltage ( V OC ). By fabricating a series of wide-bandgap perovskites (Cs 0.17 FA 0.83 PbI 3− x Br x , 0.6 ≤ x ≤ 1.6) with varying Br contents and related band gaps, it is found that, the high Br vacancy (V Br ) defect density is a significant reason that leading to large V OC deficits apart from the well-accepted halide segregation. The introduction of I-rich alkali metal small-molecule compounds is demonstrated to suppress the V Br and increase the V OC of perovskite IPVs up to 1.05 V under 1000 lux light-emitting diode illumination, one of the highest V OC values reported so far. More importantly, the modules are sent for independent certification and have gained a record efficiency of 36.36%.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2022
·Vol. 24
·期 39
·24495-24502
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IF 3.945
Min Zhu,Jiale Ding,Sen Niu,Yunhe Zhang,Guibin Wang
The construction of molecules with effective photoinduced intramolecular electron transfer (PET) and energy transfer (ET) processes is critical for the enhancement of the nonlinear optical (NLO) properties. A novel D–π–A type compound, namely tetra (C60)–LaPc, has been constructed from a molecular design perspective, wherein tetra-formyl phthalocyanine is used as a donor, four C60 as acceptors and the phenylacetylene group is introduced into it as π-electron bridge, which can increase the molecular conjugation, reduce the spatial site resistance and expand the coplanarity of the molecule, thus making the intramolecular charge transfer easier. Tetra (C60)–LaPc achieves excellent NLO properties with a giant nonlinear absorption coefficient (45 cm GW−1 and large third-order susceptibility (4.05 × 10−10 esu), which are superior to those of LaPc and C60. In addition to exhibiting a superior nonlinear optical response at 532 nm compared to the single component, tetra (C60)–LaPc also broadens the limiting range to the near-infrared region, showing a significant enhancement of the optical nonlinearity at 1064 nm. This can be attributed to the synergistic effect of the different non–linear absorption mechanisms between C60 and LaPc and the efficient PET process.
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SOLAR ENERGY
·
2022
·
IF 7.188
Wenhu Zhang,Pin Lv,Yujiao Li,Yangqing Wu,Jia Dong,Wenzhi Wang,Hairui Sun,Bingqiang Cao
Hole transport layer free perovskite solar cells (HTL-Free PSCs) have attracted extensive attention due to their advantages of simple structure and low cost. However, due to the serious energy level mismatch caused by the direct contact between the perovskite layer and the opposite electrode, the space for improving the efficiency of HTL-Free PSCs is greatly limited. We use Eu 3+ doped CsPbBr 3 quantum dots (QD) to modify the interface between MAPbI 3 :Na layer and C electrode, and study its effect on the surface defect passivation, interface energy level arrangement and carrier transport behavior in the device. It was found that compared with the interfacial modification of CsPbBr 3 QD alone, the interfacial modification of CsPbBr 3 :Eu QD could effectively solve the problem of energy level mismatch in HTL-Free PSCs, resulting in a remarkable improvement of conversion efficiency from 9.01 % to 12.95 %. Furthermore, electron beam induced current (EBIC) was used to prove that CsPbBr 3 :Eu QD interface modification significantly improved the hole collection ability. This provides an experimental basis and theoretical guidance for the optimization of the efficiency of other types of transport layer free photovoltaic devices.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Junqing Shen,Ping Guan,Aiyun Jiang,Wentao Fan,Shengnan Li,Yingliang Liu,Shengang Xu,Shaokui Cao
The intergranular interface modification of organic–inorganic hybrid perovskites (OHP) is an important issue to regulate the flexibility, stability, and resistive switching (RS) performance of resistive random-access memories (RRAMs). A novel strategy of polymer additives for OHP intergranular interface modification is explored in this work with the polyanionic backbone to improve the distribution of cage-shaped cavity molecules at the perovskite grain boundaries. Specifically speaking, poly(1-adamantylammonium acrylate) (PADAm) is first synthesized through the acid–base reaction of polyacrylic acid with 1-adamantylamine to simultaneously realize the introduction of a cage-shaped cavity molecule and the polyanionic backbone. Herein, organic ammonium cations 1-adamantylammonium (ADNH3+) in PADAm are applied as the cage-shaped cavity molecules to tune the dielectric property by being anchored at the perovskite grain boundaries. Meanwhile, polyacrylic anions in PADAm play the role of the polyanionic backbone to produce the more uniform distribution of ADNH3+. Simultaneously, the flexibility and stability of OHP RRAM devices are also improved due to the introduction of the polyanionic backbone. Consequently, the 4% ADNH3I-modified planar device exhibits the stable nonvolatile RS behavior with an on/off ratio of ∼104, even with one-month exposure under an ambient environment. Importantly, the introduction of PADAm in the flexible fibrous crosspoint of functional fiber Al@MAPbI3:PADAm and bare Al fiber further increases the on/off ratio to 108 due to the effectively improved distribution of hollow cage-shaped ADNH3+ at the perovskite intergranular interfaces together with the application of the fibrous crosspoint device configuration. Especially, these excellent crosspoint RRAM devices can be integrated into the woven fibrous RRAM array in the thermal plastic packaging configuration. In addition, the excellent multilevel RS behavior can also be realized in the woven fibrous RRAM array, indicating potential high-density data storage. This work provides a novel strategy of polymer additives bearing the polyanionic backbone to improve the flexibility, stability, and RS performance of perovskite RRAM devices.
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Advanced Energy and Sustainability Research
·
2022
·Vol. 3
·期 11
·2200055
·
IF 0
Benben Shen,Mengjiong Chen,Fan Zhang,Da Liu,Xinyi Liu,Jin Xie,Shuang Yang,Yu Hou,Hua Gui Yang
Herein, the scalable chemical bath deposited NiO x -NiSO 4 heterostructured films are reported as the efficient hole transport layers (HTLs) in perovskite solar cells. The NiO x -NiSO 4 films show excellent hole extraction ability and reduce interfacial charge recombination in solar cell devices. By using NiO x -NiSO 4 HTLs, a high power conversion efficiency of 20.55% is obtained, which is about 12.23% greater than that of the pure NiO x transport layer. This study provides a simple solution-processing route toward the large-area production and fabrication of full inorganic transport layers for perovskite photovoltaics.
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Materials Today Communications
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2022
·
IF 3.662
Cong Zhou,Fanfan Xu,Wei Wang,Wendong Nie,Weixiong You,Xinyu Ye
As an emerging optical material, all-inorganic perovskite quantum dots (QDs) have been successfully applied in some fields. However, inherent ionic properties of perovskite QDs lead to poor stability of water and heat which severely hinders the further industrial applications. Therefore, the incorporation of Metal-Organic Framework (MOF) into QDs to obtain CsPbX 3 @MOF composite is developing to improve the stability of all-inorganic perovskite QDs. In this work, a simple and fast method was developed to synthesize a CsPbBr 3 @EuBTC composite. The water stability and thermal stability of the CsPbBr 3 @EuBTC composite have been improved compared to pure CsPbBr 3 QDs. Simultaneously, luminescent properties and promising latent fingerprints and optical anti-counterfeiting applications of the CsPbBr 3 @EuBTC composite are further explored. Under fluorescent interference, it still shows excellent luminescence sensitivity and anti-interference ability. The CsPbBr 3 @EuBTC composite displays dual-mode luminescence as excited under the 365 nm or 254 nm ultraviolet (UV) excitation wavelength. Adjusting the ratio of CsPbBr 3 QDs to EuBTC in the CsPbBr 3 @EuBTC composite can also achieve multi-color luminescence. Therefore, it is expected that CsPbBr 3 @EuBTC can be applied to latent fingerprints and multi-mode optical anti-counterfeiting materials.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Wenxia Sima,Kaisen Fan,Potao Sun,Tao Yuan,Ming Yang,Zhaoping Li,Fengqi Liu,Yao Yuan
Repairing the micro-scale damage of insulating materials under a strong electric field has long been a highly desired but challenging task. Among all kinds of damage, water tree damage in the insulating materials of electrical equipment and electronic devices working in humid environments has long been considered irreparable. The main challenge is that residual water prevents the healing agent from filling the water tree branch channel. To solve this problem, this work reports a magnetically targeted, water-triggered, self-healing microcapsule (MTWTSH-MC) that makes a breakthrough against water tree damage based on microfluidic techniques. Targeted microcapsules driven by a directional magnetic field are concentrated to the vulnerable area of the insulating materials, exerting very limited effects on the dielectric. When damage breaks the microcapsules, the healing agent releases and quickly fills the damage channel and then reacts with water in the air or in the branch channel of the water tree, achieving solidification of the healing agent and self-healing of the damage channels. In this way, we can realize self-perception, self-triggering, and self-healing for both mechanical damage and water tree damage in insulation materials without any external stimulation.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 34
·26040-26049
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IF 2.779
Liu Hongtao,Miao Xinyue,Wang Kelin,Gao Jieyu,Geng Hailong,Deng Xiong
The power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs) are affected by the presence of Pb-I antisite and I vacancy defects. Here, we propose a strategy for synchronous passivation of defects by Lewis bases D-Tryptophan methyl ester hydrochloride (D-TMe·HCl). The results show that the amino and carboxyl groups in D-TMe·HCl could synchronously passivate the Pb-I antisite and I vacancy defects through ionic and hydrogen bonding. In addition, the inhibition of ion migration of Pb 2+ and I − effectively suppresses charge recombination and promotes interfacial carrier extraction. As a result, the PCE of the device with D-TMe·HCl increased to 20.59% with a fill factor of 79.8%. Furthermore, the introduction of D-TMe·HCl promotes the crystallinity of the perovskite and obtains a more dense and uniform film, thus the stability of the device is enhanced. The device with D-TMe·HCl retains more than 94% of its initial PCE after aging in a glovebox for 500 h under nitrogen conditions. This work opens up a new avenue for achieving efficient and stable PSCs by forming high-quality films, synchronously passivating defects, and inhibiting ion migration.
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