查找使用阿拉丁产品的科研文献

CsPbI2Br epitaxial shell for efficient PbS quantum dot solar cells

Rahman Sami Ur,Song Yong-Hui,Ma Zhen-Yu,Tai Xiao-Lin,Zhu Bai-Sheng,Yin Yi-Chen,Feng Li-Zhe,Hao Jing-Ming,Ding Guan-Jie,Song Kuang-Hui,Hu Ya-Lan,Li Tieqiang,Xu Jixian,Yao Hong-Bin

Lead sulfide quantum dots (PbS QDs) are promising candidates for high-performance solar cells due to their tunable bandgaps and low-cost solution processing. However, low carrier mobility and numerous surface defects restrict the performance of the fabricated solar cells. Herein, we report the synthesis of novel PbS-perovskite core-shell QDs to solve the low carrier mobility problem of PbS QDs via a facile hot injection method. CsPbI 2 Br shell enabled strain-free epitaxial growth on the surface of PbS QDs because of 98% lattice match. Our results demonstrate a significant improvement in the photoluminescence and stability of the synthesized PbS-CsPbI 2 Br QDs upon shell formation, attributed to the effective suppression of surface defects by the epitaxial shell of CsPbI 2 Br. As a result, the obtained solar cell based on PbS-CsPbI 2 Br core-shell QD exhibits a power conversion efficiency (PCE) of 8.43%, two times higher than that of pristine PbS QDs. Overall, the construction of PbS-CsPbI 2 Br core-shell structures represent a promising strategy for advancing the performance of PbS QDs-based optoelectronic devices.

Organosilica Nanodots Assisted Stability and Performance Improvements of CsPbI2Br Solar Cell

Ruoshui Li,Chunyan Deng,Yuan Xu,Lin Gao,Fengli Liu,Yu Jing,Jihuai Wu,Zhang Lan

Since the commercialization of perovskite solar cells (PSCs) for deep water, device stability has become critical. Although solar cells based on all-inorganic perovskite are a kind of device with wide application prospects due to the adjustable bandgap of the optical absorption layer material. At present, compared with organic–inorganic hybrid PSCs, there are still more unsolved problems. In this work, we introduce an organosilica nanodot (OSiND) with good electron transport ability as a complement to SnO 2 . By mixing SnO 2 nanocrystals with smaller OSiNDs, a sandstone mixed structure is formed, which promotes carrier extraction and improves the crystal quality of the perovskite layer. Devices with better performance and significantly improved stability are obtained. Through the study on hybrid perovskite and the observation of device aging results under different conditions, it is proven that OSiNDs are of great significance to obtain better quality perovskite.

NaBr-Modified CsPbI2Br Improves the Comprehensive Performance of the Solar Cells

Caidong Xie,Junshuai Li,Yanzhou Wang,Qiulu Chen,Weining Liu,Xincheng Yao,Yujun Fu,Qiming Liu,Qiang Chen,Deyan He,Yali Li

Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells

Xingyu Pu,Jian Han,Shuangjie Wang,Hui Zhou,Qi Cao,Jiabao Yang,Ziwei He,Xuanhua Li

The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI 2 Br perovskite solar cells. Surface modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI 2 Br perovskite. However, most modifiers behave high volatility and insulation, not enough to further develop the CsPbI 2 Br solar cells. Herein, an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride ([PEVIM]Cl) is applied to modify the CsPbI 2 Br film surface, yielding a compact film with enhanced crystallinity. The surface trap states of CsPbI 2 Br film are effectively passivated via the interaction between carbonyl group of [PEVIM]Cl and uncoordinated metal cations of CsPbI 2 Br perovskite, leading to charge recombination suppression and charge transport enhancement. Consequently, the power conversion efficiency (PCE) of [PEVIM]Cl modified CsPbI 2 Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 V. Moreover, the non-encapsulated device presents excellent thermal stability, still maintaining 91% PCE when heated at 85 °C in nitrogen atmosphere for 360 h. Meanwhile, the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 h. This simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.

Ambient Air Temperature Assisted Crystallization for Inorganic CsPbI2Br Perovskite Solar Cells

Yi Long,Kun Liu,Yongli Zhang,Wenzhe Li

Inorganic cesium lead halide perovskites, as alternative light absorbers for organic–inorganic hybrid perovskite solar cells, have attracted more and more attention due to their superb thermal stability for photovoltaic applications. However, the humid air instability of CsPbI2Br perovskite solar cells (PSCs) hinders their further development. The optoelectronic properties of CsPbI2Br films are closely related to the quality of films, so preparing high-quality perovskite films is crucial for fabricating high-performance PSCs. For the first time, we demonstrate that the regulation of ambient temperature of the dry air in the glovebox is able to control the growth of CsPbI2Br crystals and further optimize the morphology of CsPbI2Br film. Through controlling the ambient air temperature assisted crystallization, high-quality CsPbI2Br films are obtained, with advantages such as larger crystalline grains, negligible crystal boundaries, absence of pinholes, lower defect density, and faster carrier mobility. Accordingly, the PSCs based on as-prepared CsPbI2Br film achieve a power conversion efficiency of 15.5% (the maximum stabilized power output of 15.02%). Moreover, the optimized CsPbI2Br films show excellent robustness against moisture and oxygen and maintain the photovoltaic dark phase after 3 h aging in an air atmosphere at room temperature and 35% relative humidity (R.H.). In comparison, the pristine films are completely converted to the yellow phase in 1.5 h.Keywords:CsPbI2Br;perovskite solar cells;ambient air temperature assisted crystallization;film quality;photophysical properties

Enhanced performance of carbon-based CsPbI2Br perovskite solar cells using interfacial modifiers

Haoju Li,Yuhang Liang,Changzhong Wang,Guangli Liu,Huang Cheng,Raochen Xie,Longxiang Luo,Yannan Qian

Carbon-based CsPbI2Br perovskite solar cells (C-PSCs) have attracted significant attention as promising candidates for solar energy conversion due to their optimal bandgap, stability, and ease of fabrication. However, surface and grain boundary defects in CsPbI2Br contribute to significant non-radiative recombination and energy loss, while the energy level mismatch between the carbon electrode and CsPbI2Br exacerbates open-circuit voltage (Voc) loss, limiting photovoltaic performance. To address these challenges, 3-(trifluoromethyl)phenylthiourea (3-TPT) and 4-(trifluoromethyl)phenylthiourea (4-TPT) were introduced as interfacial modifiers. The functional groups in 3-TPT and 4-TPT, including CS, –CF3, and –NH2, effectively passivated cationic and anionic defects, reducing defect density and suppressing non-radiative recombination. Additionally, isopropyl alcohol (IPA) solutions of 3-TPT and 4-TPT promoted secondary crystallization and grain reorganization, resulting in larger grains and denser boundaries, which significantly enhanced the CsPbI2Br crystal quality. Furthermore, 3-TPT and 4-TPT modulated the band structure of CsPbI2Br, improving the energy level alignment with the carbon electrode and minimizing energy loss. The power conversion efficiencies (PCEs) of C-PSCs modified with 3-TPT and 4-TPT reached 13.78% and 14.15%, respectively, compared to 12.18% for the unmodified device. The –CF3 groups in 3-TPT and 4-TPT enhanced the hydrophobicity of CsPbI2Br, effectively mitigating moisture ingress. After 500 h in a humid environment (30% relative humidity), the modified devices retained 81.8% and 85.7% of their initial PCE, significantly outperforming the 50.6% retention of the unmodified device. This study demonstrates a simple and effective approach to improving both the efficiency and long-term stability of carbon-based CsPbI2Br solar cells.

Molecular configuration strategy for high-performance carbon-based CsPbI2Br perovskite solar cells

Cuiping Xu,Xiaofan Sun,Peiqi Ji,Min Zhao,Ziyi Xu,Hong-Ling Cai,Xiaoshan Wu

Molecular configuration strategy is proposed for buried-interface passivation in CsPbI 2 Br solar cells. • The passivation effect is dependent on both donor type and donor-site accessibility. • 1P treatment suppresses non-radiative recombination and improves charge transport. • The carbon-based CsPbI 2 Br solar cells achieves a champion PCE of 14.65%. • Unencapsulated devices PCE retain 89.3% after 2000 h and exhibit suppressed light-induced phase separation. All-inorganic CsPbI 2 Br perovskites are promising for tandem and semitransparent solar cells because of their suitable bandgaps and superior thermal stability. However, the buried-interfacial defects severely limit the efficiency and stability of solar cells. In this work, an efficient molecular configuration design strategy for buried-interfacial defects passivation is proposed. The strategy reveals that the passivation effect is significantly dependent on both donor type and donor-site accessibility of molecules. Based on this design strategy, carbon-based CsPbI 2 Br devices achieve a power conversion efficiency (PCE) of 14.65%, while unencapsulated devices retain 89.3% of their initial efficiency after 2000 h of storage and exhibit suppressed light-induced phase separation. These findings provide guidance for designing efficient interfacial passivators to optimize the efficiency and stability of perovskite solar cells.

Managing Crystallization of CsPbI2Br Films for High-Performance Indoor and Outdoor Photovoltaics

Qiu Fazheng,Sun Jiayi,Li Qi,Liu Bokai,Wang Hai-Qiao

The all-inorganic CsPbI 2 Br material shows promise for indoor photovoltaics but suffers from a severe open-circuit voltage ( V oc ) deficit under low light due to defect-mediated recombination. Here, we introduce 3,4-thiophenedicarboxylic anhydride (TDA) into the precursor solution to synergistically retard crystallization and passivate defects. Density functional theory and synergistic experiments confirm that TDA strongly coordinates with PbI 2 , outcompeting DMSO and increasing the activation energy for CsPbI 2 Br nucleation. This yields CsPbI 2 Br films with larger grains, enhanced crystallinity, and reduced trap density. Residual TDA molecules can passivate uncoordinated Pb 2+ at grain boundaries, suppressing nonradiative recombination. Using a dopant-free P3HT hole-transport layer, the optimized device achieves a champion power conversion efficiency (PCE) of 17.33% with a remarkable V oc of 1.42 V under standard illumination. Under 1000 lux LED indoor light, the device delivers a PCE of 36.22%. More importantly, TDA-optimized devices can retain 90% of initial efficiency after 1500 h in ambient air and 90% after 1000 h at 85 ° C. This work provides a facile strategy to overcome the V oc deficit and instability of CsPbI 2 Br indoor photovoltaics.

Microregion Characterization of Grain Boundary Defects and Electron Capture of CsPbI2Br Perovskite

Linkai Yu,Le Zhang,Chuwu Xing,Jing Yang,Shuai Huang,Qinghui Bao,Duofa Wang,Tianjin Zhang

All-inorganic CsPbI 2 Br perovskite solar cell shows superior thermal stability, but the power conversion efficiency falls behind organic devices, due to the existence of abundant defects. Halogen and metal ions at the grain boundaries induce the formation of defect states, which increases the probability of carrier recombination. Grain boundaries are also the channels of ion migration. Herein, as relatively simple interface engineering strategy is used at the molecular level, using a multifunctional 2,5-thiophene dicarboxylic acid to passivate the interface between the perovskite surface and the carbon electrode. The 2,5-thiophene dicarboxylic acid can effectively coordinate the undercoordinated Pb 2+ , reduce the defect concentration of perovskite, and suppress the nonradiative recombination. The device with carbon electrode exhibits a power conversion efficiency of 13.4%. The microscopic passivation mechanism is investigated by Kelvin probe force microscopy. It is observed that the surface treatment effectively passivates the defects at the grain boundary and reduces the capture rate of photogenerated carriers of the grain boundary.

Solid-State Crystallization Regulation Enables High-Performance Thermally Evaporated CsPbI2Br Perovskite Solar Cells

Yuanhao Cui,Jixuan Yang,Mengmeng Lu,Na Meng,Junhao Liu,Yuxuan Wei,Yulin Zhang,Ziqiang Wang,Yajing Li,Yutian Xu,Huili Ma,Xue Min,Zhelu Hu,Lingfeng Chao,Yingdong Xia,Qingxun Guo,Yonghua Chen

Thermal evaporation is an industry-compatible deposition technique with strong potential for scalable inorganic perovskite solar cells (PSCs), yet the performance of fully thermally evaporated CsPbI 2 Br devices remains constrained by poorly controlled solid-state crystallization, defect formation, and the unrevealed solid-state diffusion–crystallization mechanisms. Here, we report an effective solid-state crystallization regulation strategy for thermally evaporated CsPbI 2 Br, enabled by a thermally evaporated molecular regulator, dibenzo-18-crown-6 (DC), as a transient crystallization modulator. In situ measurements demonstrated that DC coordinates with Pb 2 + in the evaporated precursor stack, retarding solid-state nucleation and enabling more complete precursor diffusion and ordered grain growth during annealing. As a result, the DC-modified CsPbI 2 Br films exhibit substantially enhanced crystallinity, enlarged grain size, reduced trap-state density, and enhanced optoelectronic properties, while preserving the intrinsic bandgap of 1.92 eV. Solar cells fabricated with these films deliver a champion power conversion efficiency of 15.85%, representing the highest efficiency reported to date for thermally evaporated CsPbI 2 Br PSCs. Moreover, large-area (50 × 50 mm 2 ), sharply patterned perovskite films are readily fabricated using shadow masks, highlighting the scalability and manufacturing compatibility of this approach.

Stable High-Efficiency CsPbI2Br Solar Cells by Designed Passivation Using Multifunctional 2D Perovskite

Jie Xu,Jian Cui,Shaomin Yang,Zhike Liu,Xi Guo,Yuhang Che,Dongfang Xu,Wenjing Zhao,Ningyi Yuan,Jianning Ding,Shengzhong (Frank) Liu

CsPbI 2 Br perovskite is known for its advantages over its organic-inorganic hybrid counterpart including better thermal stability and appropriate bandgap for the front sub-cell of tandem solar cell. However, its lower-than-satisfactory efficiency, problematic phase stability and sensitivity to moisture hinder its further advancement. Here, three kinds of glycine halides (Gly- X : X = Cl, Br, and I) are strategically deigned to improve the performance of CsPbI 2 Br perovskite solar cells (PSCs). Systematic experimental and calculated results prove that a 2D/3D hybrid structure is formed, wherein the Gly-X-based 2D perovskite is mainly located at the CsPbI 2 Br grain boundaries, and the A-sites of the 2D perovskite form strong bonds with the 3D perovskite to suppress ion migration by increasing its activation energy. As a result, a power conversion efficiency (PCE) of 17.26% was obtained with an open-circuit voltage ( V OC ) of 1.33 V, which is among the best PCE values for the CsPbI 2 Br PSCs. In addition, the efficiency of encapsulated device decrease only by 14.1% after 340 h continuous illumination in ambient conditions, representing one of the most-stable inorganic PSCs reported so far. This work provides important insights into designing passivating agents to address the issue of phase segregation for the development of highly stable perovskite optoelectronic devices.

The CsPbI2Br Perovskite Solar Cell with High Open-Circuit Voltage by Crystallization Optimization

Shanjing Liu,Xinyu Xu,Chuwu Xing,Guanming Ge,Duofa Wang,Tianjin Zhang

All-inorganic CsPbI 2 Br perovskite acquires affirmation in recent years by reason of the excellent balance between stability and power conversion efficiency (PCE), but its PCE is still inferior to the commercial application standard, of which inferiority roots from the uncontrolled crystallization and a mass of the imperfections. Herein, the crystallization is regulated by introducing a certain amount of lead acetate into the precursor, and the complex Pb(Ac) 2 × DMSO × PbI 2 forms in precursor. The Oswald crystal pattern changes into the 2D layered structure —3D cubic structure crystal pattern, and this transition process is delayed, and the complex in precursor is regarded as the 2D crystal growth template. And the iodine vacancy defects are passivated by the Ac − , and the PbO passivates the grain boundary defects, as proved by the photoluminescence spectrum and X-ray photoelectron spectroscopy. The two effects work together improve the performance of the CsPbI 2 Br perovskite solar cells. The PCE increases from 9.78% to 13.73%, and the open-circuit voltage increases from 1.23 to 1.32 V, which is one of the superior performances reported for the carbon-based pure CsPbI 2 Br perovskite solar cells to date.