Origin of Dark Current and Detailed Description of Organic Photodiode Operation Under Different Illumination Intensities

被引:42
作者
Fallahpour, A. H. [1 ]
Kienitz, S. [1 ]
Lugli, P. [1 ]
机构
[1] Tech Univ Munich, Elect Engn & Informat Technol, Inst Nanoelect, D-80333 Munich, Germany
关键词
Dark current; modeling and simulation; organic photodiode; trap state; HETEROJUNCTION SOLAR-CELLS; SPECTROSCOPY; EFFICIENCY; LIFETIME; DEVICES;
D O I
10.1109/TED.2017.2696478
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Solution-processed organic-based photodetectors (OPDs) provide the opportunity to develop innovative, low cost, and large-area imaging technologies for industrial applications. However, compared to inorganic-based photodetectors, OPD devices have shown noticeably higher dark current and relatively lower sensitivity which is critical when the sensor needs to detect signals under low illumination intensities. Thus, to improve the design of OPDs, it is very important to know how opto-electrical response of the device is limited under the influences of structure, contact, and material layer properties. To analyze such limits, we employ a drift-diffusion approach to simulate a well-known and well-reproducible organic-based photodiode structure. Good agreement between current-voltage characteristics of the simulated result and experimental measurements under different illumination intensities confirms the presence of the traps is the origin of the high dark current in OPD devices. In addition, it is shown that traps have a dominant influence on the current-voltage characteristics of the device at low intensities, critical issue in several applications such as indirect X-ray detection technology. Based on this paper, to enhance OPD device performance operating in low intensities, it is recommended to put effort into processing (designing) a trap-free structure (material), rather than improving the material layer, structure, and contact properties.
引用
收藏
页码:2649 / 2654
页数:6
相关论文
共 25 条
[1]   Investigation of the Blend Morphology in Bulk-Heterojunction Organic Solar Cells [J].
Albes, Tim ;
Lugli, Paolo ;
Gagliardi, Alessio .
IEEE TRANSACTIONS ON NANOTECHNOLOGY, 2016, 15 (02) :281-288
[2]  
Arca F., 2013, THESIS, P128
[3]   Thick junction broadband organic photodiodes [J].
Armin, Ardalan ;
Hambsch, Mike ;
Kim, Il Ku ;
Burn, Paul L. ;
Meredith, Paul ;
Namdas, Ebinazar B. .
LASER & PHOTONICS REVIEWS, 2014, 8 (06) :924-932
[4]   Effect of P3HT:PCBM concentration in solvent on performances of organic solar cells [J].
Baek, Woon-Hyuk ;
Yang, Hyun ;
Yoon, Tae-Sik ;
Kang, C. J. ;
Lee, Hyun Ho ;
Kim, Yong-Sang .
SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2009, 93 (08) :1263-1267
[5]   Time dependence and freezing-in of the electrode oxygen plasma-induced work function enhancement in polymer semiconductor heterostructures [J].
Brown, Thomas M. ;
Lazzerini, G. Mattia ;
Parrott, Lisa J. ;
Bodrozic, V. ;
Buergi, Lukas ;
Cacialli, Franco .
ORGANIC ELECTRONICS, 2011, 12 (04) :623-633
[6]   Built-in field electroabsorption spectroscopy of polymer light-emitting diodes incorporating a doped poly(3,4-ethylene dioxythiophene) hole injection layer [J].
Brown, TM ;
Kim, JS ;
Friend, RH ;
Cacialli, F ;
Daik, R ;
Feast, WJ .
APPLIED PHYSICS LETTERS, 1999, 75 (12) :1679-1681
[7]  
Buechele P, 2015, NAT PHOTONICS, V9, P843, DOI [10.1038/nphoton.2015.216, 10.1038/NPHOTON.2015.216]
[8]   The identification, characterization and mitigation of defect states in organic photovoltaic devices: a review and outlook [J].
Carr, John A. ;
Chaudhary, Sumit .
ENERGY & ENVIRONMENTAL SCIENCE, 2013, 6 (12) :3414-3438
[9]   Organic photoresponse materials and devices [J].
Dong, Huanli ;
Zhu, Hongfei ;
Meng, Qing ;
Gong, Xiong ;
Hu, Wenping .
CHEMICAL SOCIETY REVIEWS, 2012, 41 (05) :1754-1808
[10]   Open circuit voltage of organic solar cells: an in-depth review [J].
Elumalai, Naveen Kumar ;
Uddin, Ashraf .
ENERGY & ENVIRONMENTAL SCIENCE, 2016, 9 (02) :391-410