PIN architecture for ultrasensitive organic thin film photoconductors

Jin, Zhiwen; Wang, Jizheng

doi:10.1038/srep05331

Cited by 45 publications

(19 citation statements)

References 51 publications

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“…By taking advantage of this photoprecursor approach, we have also solution-processed p–n double-layer structures containing acene compounds that are hardly soluble17. The present work expands the scope of photoprecursor approach to fabrication of the p–i–n triple-layer architecture which is more relevant to high-performance OPVs as well as other organic electronic devices such as light-emitting diodes18 and photoconductors19.…”

mentioning

confidence: 88%

Photoprecursor approach as an effective means for preparing multilayer organic semiconducting thin films by solution processes

Yamaguchi

Suzuki

Motoyama

et al. 2014

Sci Rep

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The vertical composition profile of active layer has a major effect on the performance of organic photovoltaic devices (OPVs). While stepwise deposition of different materials is a conceptually straightforward method for controlled preparation of multi-component active layers, it is practically challenging for solution processes because of dissolution of the lower layer. Herein, we overcome this difficulty by employing the photoprecursor approach, in which a soluble photoprecursor is solution-deposited then photoconverted in situ to a poorly soluble organic semiconductor. This approach enables solution-processing of the p-i-n triple-layer architecture that has been suggested to be effective in obtaining efficient OPVs. We show that, when 2,6-dithienylanthracene and a fullerene derivative PC71BM are used as donor and acceptor, respectively, the best p-i-n OPV affords a higher photovoltaic efficiency than the corresponding p-n device by 24% and bulk-heterojunction device by 67%. The photoprecursor approach is also applied to preparation of three-component p-i-n films containing another donor 2,6-bis(5′-(2-ethylhexyl)-(2,2′-bithiophen)-5-yl)anthracene in the i-layer to provide a nearly doubled efficiency as compared to the original two-component p-i-n system. These results indicate that the present approach can serve as an effective means for controlled preparation of well-performing multi-component active layers in OPVs and related organic electronic devices.

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mentioning

confidence: 88%

Photoprecursor approach as an effective means for preparing multilayer organic semiconducting thin films by solution processes

Yamaguchi

Suzuki

Motoyama

et al. 2014

Sci Rep

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“…All the obtained films display compact and uniform morphology without observable pinholes. Note that in the SEM images, components with different conductivities are displayed in different shades of gray 47, 48. The control film made without the CsPbCl 3 QDs shows essentially all dark grains throughout the image, indicating only PVK grains without PbI 2 .…”

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confidence: 99%

CsPbCl₃‐Driven Low‐Trap‐Density Perovskite Grain Growth for >20% Solar Cell Efficiency

et al. 2018

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Charge recombination in grain boundaries is a significant loss mechanism for perovskite (PVK) solar cells. Here, a new strategy is demonstrated to effectively passivate trap states at the grain boundaries. By introducing a thin layer of CsPbCl3 coating before the PVK deposition, a passivating layer of PbI2 is formed at the grain boundaries. It is found that at elevated temperature, Cl− ions in the CsPbCl3 may migrate into the PVK via grain boundaries, reacting with MA+ to form volatile MACl and leaving a surface layer of PbI2 at the grain boundary. Further study confirms that there is indeed a small amount of PbI2 distributed throughout the grain boundaries, resulting in increased photoluminescence intensity, increased carrier lifetime, and decreased trap state density. It is also found that the process passivates only grain surfaces, with no observable effect on the morphology of the PVK thin film. Upon optimization, the obtained PVK‐film‐based solar cell delivers a high efficiency of 20.09% with reduced hysteresis and excellent stability.

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“…Where I p represents current under white light and I d represents current in dark. P in represents the effective incident light power on effective region (electrode channel region) [15]. Responsivity ( R ) can be enhanced by decreasing the electrode channel length, illumination power P in , and by increasing bias voltage [30].…”

Section: Resultsmentioning

confidence: 99%

Solution Processed Trilayer Structure for High-Performance Perovskite Photodetector

Khan

et al. 2018

Nanoscale Res Lett

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Due to their outstanding performance, low cost, ease of fabrication, diverse photonic, and optoelectronic applications, metal halides perovskite have attracted extensive interest in photodetector applications. Currently, devices made by metal oxides, metal sulfides, and 2D materials had achieved good responsivity, but suffered from high dark current, slow response speed, small on-off ratio, and poor stability. Whole performances of these photodetectors are not satisfactory. Here, a lateral perovskite (CH3NH3PbBr3)/Ethanolamine/TiO2 (in ethanol) trilayer photodetector is designed for achieving high performance. EA treatment enhances electron extraction and reduces undesired recombination. This trilayer device shows good performances with low dark current of 1.5 × 10−11 A, high on-off ratio of 2700, high photodetectivity of 1.51 × 1012 Jones, high responsivity of 0.13 A W−1, and high stability, comparative to conventional single layer devices. This work provides the way to improve the performance of metal halide perovskite photodetectors.

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PIN architecture for ultrasensitive organic thin film photoconductors

Cited by 45 publications

References 51 publications

Photoprecursor approach as an effective means for preparing multilayer organic semiconducting thin films by solution processes

Photoprecursor approach as an effective means for preparing multilayer organic semiconducting thin films by solution processes

CsPbCl₃‐Driven Low‐Trap‐Density Perovskite Grain Growth for >20% Solar Cell Efficiency

Solution Processed Trilayer Structure for High-Performance Perovskite Photodetector

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PIN architecture for ultrasensitive organic thin film photoconductors

Cited by 45 publications

References 51 publications

Photoprecursor approach as an effective means for preparing multilayer organic semiconducting thin films by solution processes

Photoprecursor approach as an effective means for preparing multilayer organic semiconducting thin films by solution processes

CsPbCl3‐Driven Low‐Trap‐Density Perovskite Grain Growth for >20% Solar Cell Efficiency

Solution Processed Trilayer Structure for High-Performance Perovskite Photodetector

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CsPbCl₃‐Driven Low‐Trap‐Density Perovskite Grain Growth for >20% Solar Cell Efficiency