Advanced Optical Materials
·
2025
·Vol. 13
·期 14
·2403448
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IF 7.2
Yanjun Duan,Mingxin Hu,Shengren Li,Wenxin Dong,Wei Dang,Lin Yang,Yingnan Guo,Zhiqiang Li
Short-wave infrared (SWIR) detectors are becoming increasingly vital in areas such as autonomous driving, food inspection, medical diagnostics, and scientific exploration. Recently, Te x Se 1–x has exhibited exceptional promise for infrared photodetection. However, Te x Se 1–x -based devices still struggle with excessively high dark current and subpar performance. This work presents an interface engineering via selenization in the SnO x /Te 0.73 Se 0.27 heterojunction SWIR photodetector. The post-selenization modifies the surface properties of SnO x , reduced the interface defect density, and enlarged the built-in potential in the junction. Moreover, this interface engineering leads to improved band alignment, facilitating charge transport and collection. As a result, the improved device achieves a reduced dark current density from 1.6 × 10 −6 A cm −2 to 1.4 × 10 −7 A cm −2 at zero bias voltage. The device exhibits a broad-spectrum response ranging from 300 to 1700 nm, with a room-temperature responsivity of 0.33 A W −1 at 980 nm, a specific detectivity of 6.61 × 10 10 Jones, a -3 dB bandwidth of 120 kHz, and a linear dynamic range of 110 dB. Moreover, its applications in the short-wave infrared single-pixel imaging is demonstrated.
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Journal of the American Chemical Society
·
2025
·
IF 15.6
Sai Feng,Renad Almughathawi,Andrej Weber,Songjun Hou,Chengyang Zhang,Jan S. Wössner,Birgit Esser,Colin Lambert,Qingqing Wu,Yueqi Li,Jinghong Li
Antiaromatic compounds are of great interest due to their narrow highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gaps, high reactivity, and enhanced charge mobility, yet their role in single-molecule electronics is still not well understood. Using electrochemically controlled scanning tunneling microscopy break junction (ECSTM-BJ) measurements, we compared the energy-alignment-dependent conductance of the aromatic [10]cycloparaphenylene ([10]CPP) and the antiaromatic [4]cyclodibenzopentalene ([4]CDBP). While [10]CPP showed a single conductance state via the HOMO, [4]CDBP exhibited two distinct states involving both the HOMO and LUMO. Our analysis and DFT calculations attribute this dual-state behavior to unique anchoring mode and energy-level realignment within a narrow HOMO-LUMO gap. This property enables electron- and hole-dominated pathways that depend on the anchoring configuration and coexist at a fixed gate potential. This phenomenon, also observed in the [4]CDBP⊃C60 structure, highlights the potential of antiaromatic molecules for advanced molecular electronics.
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ACS Applied Electronic Materials
·
2025
·
IF 4.7
Yibo Zhou,Limin Lai,Yongjie Zhang,Ziyue Wang,Guiyuan Liu,Ying Ma
Metal halide perovskites, particularly those with narrow bandgaps and broadband response, have emerged as promising candidates for photodetectors due to their outstanding optoelectronic properties and cost-effectiveness. Among these, CsPbI2Br films are notable for relatively high stability; however, they often suffer from phase segregation and operational instability, primarily caused by a substantial number of defects at the surface and grain boundaries. In this work, we present a bulk and surface copassivation strategy to mitigate such defects in CsPbI2Br films. This strategy involves the introduction of a pseudohalide salt, NH4SCN, in both the crystallization and post-treatment processes. The SCN– anions can substitute for I– anions or occupy iodide vacancies through strong coordination with Pb2+, thereby facilitating homogeneous crystal growth and reducing the defect density in the CsPbI2Br films by ∼60%. As a result, photodetectors fabricated from NH4SCN-passivated CsPbI2Br films exhibit a low dark current density of 1.30 × 10–10 A cm–2 at −0.1 V and a high specific detectivity of 4.09 × 1012 Jones at 10 Hz, outperforming most previously reported CsPbX3 vertical photodetectors. Moreover, these devices demonstrate excellent operational and ambient stability. This work highlights that bulk and surface copassivation using pseudohalide salts represents a facile and effective approach for developing stable and high-performance perovskite optoelectronic devices.
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ACS Nano
·
2025
·
IF 16
Zhenyu Wang,Guoxin Wu,Jiancun Wang,Jiashuo Xu,Hailong Liu,Zhengyan He,Dan Huang,Ivan Yu Dmitriev,Zhaolai Chen,William W. Yu,Liang Wang
Wide-bandgap (WBG) perovskite solar cells (PSCs) are critical for tandem solar cells, yet their fabrication in ambient air─a critical requirement for industrial scaling─introduces grain boundary (GB) defects that impede charge transport. Here, we present a grain boundary band inversion strategy using lead dibutyldithiocarbamate (PbDBuDTC) as an interfacial passivator, which simultaneously mitigates defects and reconstructs the energy landscape in 1.68 eV WBG perovskite films. Kelvin probe force microscopy reveals that PbDBuDTC treatment reverses the work function disparity between GBs and grain interiors, transforming the inherent p-n-p junction across GBs into an n-p-n configuration, thereby facilitating charge separation. Coupled with vacancy defect passivation, the resulting inverted device achieves a power conversion efficiency (PCE) of 22.2%, one of the highest PCE for air-processed WBG PSCs. Furthermore, the reductive property of PbDBuDTC (reducing I2 and I3– to I–) and hydrophobic butyl chains confer exceptional stability, with unencapsulated devices retaining 90.7% of their initial PCE after 1000 h at 25 °C and 30% relative humidity. This work adopts a defect-engineering strategy that reconciles high efficiency with ambient-air compatibility, advancing the industrialization of perovskite photovoltaics.
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Advanced Photonics Research
·
2025
·
IF 3.9
Maoyuan Zhang,Tianyu Zhao,Shuaishuai Fang,Guanying Chen
Stability is an important factor affecting the application of perovskite solar cells (PSCs). The decomposition of perovskite materials induced by ultraviolet (UV) light is one of the reasons influencing the stability. Herein, a simple method for enhancing the stability of n– i –p PSCs by using CsCl to modify the interface between the electron transport layer and the perovskite. The results show that the introduction of CsCl to modify the interface is conducive to the growth of perovskite films and inhibits the interface recombination, which effectively improves the efficiency and stability of PSCs. Compared with the control PSCs, the champion target PSCs showed higher power conversion efficiency (from 21.21% to 23.73%). In addition, the UV light stability is also improved by about four times. This work emphasizes the importance of CsCl modified interface, and provides an effective way to achieve efficient and stable PSCs at the same time.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Shun Xu,Huafang Zhang,Hong Cui,Haohao Tao,Lingying Cheng,Gencai Pan,Huiping Gao,Zhenlong Zhang,Yanli Mao
Quasi-two-dimensional (2D) Ruddlesden–Popper perovskites (general formula A2Bn–1PbnX3n+1) have received extensive attention in the field of photoelectric detection due to their tunable optical band gap and excellent stability. However, the prepared 2D perovskite films are generally composed of samples with different n values. With the increase of n, the photoelectric performance is improved due to the decreased binding energy, but the thermodynamic stability is decreased. Therefore, it is necessary to find a method that can simultaneously promote the formation of a large n-value perovskite and improve its stability. In this work, we fabricated a photodetector based on the typical quasi-2D perovskite BA2MAPb2I7 (n = 2) and promoted the formation of a large n-phase quasi-2D perovskite in BA2MAPb2I7 by slowing down its recrystallization rate of perovskite through adding a metal–organic framework (ZIF-8) solution on the top of the BA2MAPb2I7 layer. Concurrently, the organic ligands present in ZIF-8 effectively passivated the defects in BA2MAPb2I7 and enhanced its stability. The obtained photodetectors show a high detection rate of 1.03 × 1013 Jones, a high responsiveness of 0.925 A/W, a high switching ratio of 105, and excellent long-term operating stability, light stability, and environmental stability without packaging. This work provides a feasible way to further improve the photoelectric performance and stability of quasi-2D perovskites.
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Journal of Materials Chemistry C
·
2025
·
IF 5.1
Chenrun Liu,Ziqi Wu,Peisheng Nong,Qiuting Cai,Xingliang Dai,Bobo Li,Haiping He,Wang Zhang,Mingxia Qiu
Perovskite light-emitting diodes (PeLEDs) have significant potential for display and lighting applications. However, the intrinsic issues such as material stability, efficiency limitation, spectral purity and color gamut challenges have hindered the development process. In this work, the efficient blue light PeLEDs were obtained through multiple modifications of doping strategy and surface passivation. Incorporating NdCl3 into CsPbBr3 perovskite nanocrystals (PeNCs) causes lattice contraction and improves crystallization quality, thereby increasing the photoluminescence quantum yield (PLQY) and reducing non-radiative recombination. Further homogeneous passivation with didodecyl dimethylammonium chloride (DDAC) can effectively fill the halogen vacancies on the surface of PeNCs, thus to reduce surface defects. Ultimately, the PeLEDs achieved a highest external quantum efficiency (EQE) of 15.74% at the emission wavelength of 478 nm. This study can provide important insights into the multi-component regulation of high-performance blue light PeLEDs and build the foundation for their practical application in full-color display.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Wenxiang Zhou,Qinming Wang,Jinlin Wan,Xingfu Zhou
The modification of the interface represents a crucial step in the preparation of efficient and stable carbon-based perovskite solar cells(C–PSCs). A multifunctional interfacial material 1-phenylguanidine hydrochloride (PGCl) was introduced between the double electron transport layer of TiO 2 /SnO 2 and perovskite to modify the interface and promote the crystal growth. The Cl - in PGCl can passivate oxygen vacancies and chemically link to ETL through electrostatic coupling , while helping to fix PbI 2 in perovskite. The grain size increase while the surface roughness decreases in the PGCl-modified ETL. The internal electric field attribute to the increase of the open-circuit voltage. The method achieves better energy orientation, fewer interface defects and uniform perovskite crystals, achieving an impressive power conversion efficiency (PCE) of 15.52 %, an open circuit voltage of 0.94 V, and a substantial increase in the fill factor to 77.96 %. The C-PSC based on PGCl modification show 15.4% increase in PCE. More importantly, the initial PCE of the unpackaged device remains at 75.4% after aging for 300 h at 45-50 °C and 60-70% relative humidity . The findings indicate that the incorporation of PGCl represents a promising approach to modifying the perovskite interface and regulating the crystallization of perovskite, with the objective of achieving efficient and stable C–PSCs.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xingyu Pan,Li Chen,Dingyiran Wu,Yijie Wang,Zhaoqiong Chen,Youdong Hu,Bingsuo Zou
While lead halide perovskite quantum dots (QDs) offer exceptional optoelectronic properties for photodetection, their performance and stability are severely limited by pervasive surface and bulk defects in film form. To address this critical challenge, we report a synergistic interfacial-bulk dual passivation strategy. This approach combines interface engineering between the hole transport layer (HTL) and the active layer with bulk heterojunction optimization within the active layer. Specifically, a hybrid active layer of CsPbBr3 QDs and poly(3-hexylthiophene) (P3HT) is employed, which simultaneously passivates QDs surface defects, improves film morphology, and establishes a built-in electric field for efficient charge separation and transport. Concurrently, nonradiative recombination in the films was significantly mitigated through the effective passivation of interfacial defects between the HTL and the active layer, achieved by a hybrid passivator comprising tributylphosphine oxide (TBPO, C12H27OP) and calcium bromide (CaBr2). The resultant self-powered photodetector achieves an ultralow dark current of 2.01 × 10–13 A. Under 0.25 mW/cm2 illumination at zero bias, the optimized photodetector demonstrates outstanding performance: a high responsivity of 1.25 A/W, a specific detectivity of 9.85 × 1014 Jones, and a photosensitivity of 6.25 × 107. This work provides a generalized defect-management paradigm for developing high-performance, self-powered perovskite optoelectronic devices.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Sasikumar Mayarambakam,Shasha Yang,Yue Jiang,Licheng Liu,Zhengchi Yang,Xinbo Shi,Olivier Boyron,Bruno Schmaltz
The strategic molecular design of interfacial layers presents a critical pathway to mitigate losses in perovskite photovoltaics. Here, we engineer two carbazole-based polymers with distinct connectivity patterns, 3,6–3,6-Cbz and 3,6–2,7-Cbz, to systematically investigate molecular connectivity-dependent interfacial phenomena in planar n-i-p PSCs. Comprehensive structure–property analyses reveal that the 3,6–2,7-Cbz architecture enables exceptional π-electron delocalization and optimal energy level alignment, simultaneously achieving (i) superior perovskite surface defect passivation and (ii) interfacial recombination suppression. When implemented as an interfacial modifier, the 3,6–2,7-Cbz polymer delivers a champion device efficiency of 24.16% (Voc = 1.16 V, Jsc = 25.60 mA/cm2, FF = 80.86%) with Spiro-OMeTAD as the HTL representing a significant improvement over both the control (22.61%) and 3,6–3,6-Cbz analogue (22.58%). Strikingly, this approach maintains high performance (23.17% PCE) even with undoped carbazole HTLs (Cz-Pyr), demonstrating remarkable versatility. Through correlated XPS and SCLC characterization, we establish clear structure-performance relationships between polymer connectivity and charge transport dynamics. This work provides fundamental insights into molecular topology engineering for advanced interfacial materials in next-generation photovoltaics.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yuhuan Lin,Jiayi Li,Jiayu Zheng,Jun Shao,Ming Wu,Yulin Liu,Ziqiao Wu,Jiandong Fan,Wenzhe Li
Cesium-based all-inorganic lead-halide perovskites CsPbX3 (X = I, Br, Cl) have emerged as highly promising optoelectronic materials with a wide bandgap, which are commonly utilized in tandem solar cells. However, the I–Br hybrid CsPbI3–xBrx perovskites still face stability issues such as halide segregation-induced phase transition and decomposition under ultraviolet or high-temperature conditions. We synthesize a series of single crystals DMAPbI3–xBrx (x = 0.1, 0.15, 0.2, 0.3, 0.6), featuring an I–Br ordered distribution. By introducing the crystal intermediate into the perovskite precursor, we successfully obtained high-quality CsPbI3–xBrx thin films, exhibiting high stabilities and low trap state density. The formation kinetics of the high-quality perovskite thin films are in situ studied and the possible reaction mechanisms are proposed. Benefiting from this approach, the solar cells have an improved photoelectric conversion efficiency and significantly enhanced thermal stability. This method is proven to be feasible and innovatively offers a new strategy for the continuous development of mixed-halide perovskite solar cells.
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ENERGY & FUELS
·
2025
·
IF 5.3
Qingxiang Zhang,Dengqian Zhang,Zhen Wang,Zheng Liu,Yukun Xi,Wei Zhang,Chen Zhang,Yin Liu
Catalytic transfer hydrodechlorination of plastic pyrolysis oil on supported transition-metal catalysts using isopropanol as a hydrogen donor was investigated in this work. The catalysts were characterized by N2 adsorption, X-ray diffraction, hydrogen temperature-programmed desorption, and X-ray photoelectron spectroscopy, and the reaction products were identified by GC-MS. Among various Al2O3-supported transition-metal (Cu, Co, Ni) catalysts, Cu/Al2O3 exhibited the best catalytic transfer hydrodechlorination performance due to the superior activation ability of Cu/Al2O3 for isopropanol. The doping of Ni in Cu/Al2O3 significantly enhanced its catalytic activity due to the inherent excellent hydrogenation activity of Ni, good metal dispersion, and strong Ni–Cu interaction in Ni–Cu/Al2O3. GC-MS results revealed that chlorobenzene was hydrogenated to benzene and HCl, and isopropanol was dehydrogenated to form acetone, which was subsequently transformed to methyl isobutyl ketone. The reactivities of three representative organochlorine compounds followed the order of chlorobenzene > tetrachloroethane > tetrachloroethylene. Ultradeep dechlorination of real plastic pyrolysis oil was achieved by catalytic transfer hydrodechlorination over the optimal 15Ni-10Cu/Al2O3 catalyst. The chlorine content of real plastic pyrolysis oil was reduced from 61.7 to 0.5 mg/L with a chlorine removal of 99.2% after reaction for 3 h at the reaction temperature of 210 °C.
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