Crystals
·
2017
·Vol. 8
·期 1
·4
·
IF 1.566
Xianli Li,Yan Guo,Binbin Luo
Organic–inorganic CH3NH3PbCl3perovskite nanocrystals (PNCs) doped with Mn2+, CH3NH3PbxMn1−xCl3, have been successfully prepared using a reprecipitation method at room temperature. Structural and morphological characterizations reveal that the CH3NH3PbxMn1−xCl3PNCs with cubic phase transforms from particles to cubes and increases in size from 16.2 ± 4.4 nm in average diameter to 25.3 ± 7.2 nm in cubic length after the addition of Mn2+precursor. The CH3NH3PbxMn1−xCl3PNCs exhibit a weak exciton emission at ~405 nm with a low absolute quantum yield (QY) of around 0.4%, but a strong Mn2+dopant emission at ~610 nm with a high QY of around 15.2%, resulting from efficient energy transfer from the PNC host to the Mn2+dopant via the4T1→6A1transition. In addition, the thermal and air stability of CH3NH3PbxMn1−xCl3PNCs are improved due to the passivation with (3-aminopropyl) triethoxysilane (APTES), which is important for applications such as light emitting diodes (LEDs).Keywords:perovskite;Mn2+doping;CH3H3PbCl3;stability
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jialin Yang,Kewei Liu,Zhen Cheng,Pengtao Jing,Qiu Ai,Xing Chen,Binghui Li,Zhenzhong Zhang,Ligong Zhang,Haifeng Zhao,Dezhen Shen
Recent investigations indicate that the performance of organic–inorganic perovskite optoelectronic devices can be improved by combining the perovskites and the inorganic materials. However, very few studies have focused on the investigation of perovskites/inorganic semiconductor hybrid UV photodetectors and their detailed performance-enhancement mechanism is still not very clear. In this work, a CH3NH3PbCl3/ZnO UV photodetector has been first demonstrated and investigated. Both the photoresponsivity and response speed of the hybrid device are higher than those of pure CH3NH3PbCl3 and ZnO devices. The photoluminescence and transient absorption spectra indicate that the photoinduced electron transfer between CH3NH3PbCl3 and ZnO should be responsible for the performance enhancement of the hybrid device. In addition, the high crystal quality of CH3NH3PbCl3 on ZnO film is another important reason for the excellent UV detection performance. Our findings in this work provide new insights into the intrinsic photophysics essential for perovskite optoelectronic devices.
研究领域:
光电子学
·
材料科学
·
半导体器件
·
光物理
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Zhan Zhang,Lixia Ren,Hong Yan,Shujin Guo,Shuanhu Wang,Min Wang,Kexin Jin
Single crystals of heterovalent Bi-doped CH3NH3PbCl3 perovskite have been successfully grown through the inverse temperature crystallization method. Bandgap narrowing of 300 meV (a 55 nm red-shifting absorption edge) is obtained for the nominal 20% Bi-doped crystal with the host structure and the energy at the top of the valence band invariable. It is observed that the contact between the Au electrodes and single crystals transforms from Ohmic to Schottky, and the conductivity increases with increasing Bi doping level. By contrast, the Bi-doped CH3NH3PbCl3 thin films are also prepared, and the similar bandgap narrowing is found, although the narrowing degree is less than that in single crystals. This work has a comprehensive understanding of Bi-doped single crystals and thin films, providing further optoelectronic applications for these promising solution-processed hybrid perovskite semiconductor materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zhen Cheng,Kewei Liu,Jialin Yang,Xing Chen,Xiuhua Xie,Binghui Li,Zhenzhong Zhang,Lei Liu,Chongxin Shan,Dezhen Shen
A hybrid perovskite MAPbCl3 (MA = CH3NH3+) single crystal is considered to be one of the most viable candidates for the development of photodetectors because of its outstanding optoelectronic properties. However, the relatively lower crystalline quality of the reported MAPbCl3 single crystals fabricated by the traditional one-step inverse temperature crystallization results in momentous degradation in the performance of their photodetectors. Here, we present a novel two-step temperature process to fabricate high-quality MAPbCl3 single crystals, namely, lower temperature nucleation and higher temperature crystallization. These MAPbCl3 single crystals present low defect density (∼7.9 × 109 cm–3) commensurate with the best-quality crystals of hybrid organic–inorganic lead halide perovskites reported so far. Moreover, a high-performance ultraviolet photodetector was demonstrated on MAPbCl3 single crystals. At 30 V, the peak responsivity at 415 nm of the photodetector is as high as 3.73 A W–1 (light intensity = 1 mW cm–2), ∼2–3 orders of magnitude higher than that of the previously reported MAPbCl3 photodetectors. Meanwhile, the device has an ultrafast response speed with a rise time of 130 ns, which is one of the shortest values of MAPbX3-based photodetectors. Our findings open a new way to obtain high-quality perovskite single crystals and their high-performance photodetectors.
研究领域:
光电子学
·
材料科学
·
半导体器件
·
光电探测器
·
钙钛矿材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 18
·5442-5450
·
IF 6.641
Zhishuai Yuan,Wei Huang,Shoutao Ma,Gang Ouyang,Wei Hu,Wei Zhang
Hybrid organic–inorganic lead halide perovskites (CH3NH3PbX3, X = Cl, Br, or I) are deemed to be the highest potential semiconducting materials due to their unique optoelectronic properties. Nowadays, most perovskite photodetectors are fabricated on the basis of thin films, and their performances are limited by the low carrier mobility and high trap density of the thin films. Herein, a high performance photodetector was fabricated via a method involving inversion temperature precision gradient crystallization (ITPGC) for the first time, which is an improvement on traditional methods. The structure of the bulk single crystal is confirmed via XRD and TEM characterization. Also, in terms of nucleation and growth theory, the growth mechanism is explained in detail and the best growth temperature is suggested to be 80 °C for the first time. Benefiting from this, a photodetector with ultra-high responsivity of 7.97 A W−1 is obtained, which is superior to thin film photodetectors. Also, a rise time of 1.27 ms and a fall time of 1.84 ms are obtained, which are regarded as pioneering values for this type of system. Meanwhile, the study also provides new ideas for the preparation of bulk single crystals.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Physics
·
2021
·
IF 3.56
Zhao Jingda,Wang Xin,Pan Yuzhu,Xu Yubing,Li Yuwei,Chen Jing,Wu Jun,Li Qing,Zhao Zhiwei,Zhang Xiaobing,Akram Javed,Bae Byung Seong,Yang Haining,Lei Wei
Organic-inorganic hybrid methylammonium lead halide perovskite MAPbX3 (where MA = CH3NH3, and X = Cl, Br, I) single crystals are potential semiconductors for photo-detection due to their excellent optoelectronic performance. In particular, MAPbCl3 single crystal is a wide-band-gap (2.9 eV) semiconductor which is suitable for ultraviolet (UV) detection. In this work, n−-n+ photo-diodes are fabricated through solution-processed epitaxial growth, growing Bi-doped MAPbCl3 epitaxial layer on MAPbCl3 single crystal substrate. The epitaxial layer effectively improves the interface between n−-type and n+-type layers and leads to low dark current. This work provides useful information for UV detection based on perovskites.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 6
·2202383
·
IF 9
Ziyang Wang,Xinyuan Zhang,Jianbo Wu,Lishan Liang,Xinyi Niu,Qin Chen,Ruiqing Li,Junhua Luo
Organic–inorganic hybrid MAPbCl 3 perovskite (MA + = CH 3 NH 3 + ) in UV photodetection is drawing interest due to its superior semiconductor properties and UV-matchable optical bandgap. However, MAPbCl 3 -based photodetector targeting high-performance polarized light detection has remained unexplored due to the isotropic structure of MAPbCl 3 . The photovoltaic effect in the heterojunction, which shows an angle dependence on light polarization, provides opportunities to break the restriction of intrinsic structure for realizing polarization-sensitive photodetection. Herein, an effective strategy is reported to realize high-performance polarization-sensitive UV photodetection by constructing a heterojunction with two isotropic materials MAPbCl 3 and Silicon (Si). Emphatically, the photovoltage in MAPbCl 3 /Si heterojunction changes with the angle of polarized light with the maximum (minimum) value of 0.15 V (0.05 V), originating from the built-in electric field. More interestingly, driven by the photovoltage, the device thus exhibits a large polarization ratio ( I max / I min ) of 2.9 at 377 nm under the self-driven mode. Besides, the present device also delivers high-performance photodetection in UV region owing to the superior photoresponse of MAPbCl 3 , including a high detectivity ( D* ) of 2.93 × 10 11 Jones, a superior responsibility of 8 mA W –1 , a substantial switching ratio of 900, and an ultrafast response speed of 40/98 µs at 0 V bias. This work opens a new avenue for high-performance polarization-sensitive photodetection by utilizing angle-dependent photovoltage effect.
研究领域:
材料科学
·
光电子学
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）