Correlation of hole mobility, exciton diffusion length, and solar cell characteristics in phthalocyanine/fullerene organic solar cells

2007 ◽  
Vol 90 (10) ◽  
pp. 103515 ◽  
Author(s):  
Yuhki Terao ◽  
Hiroyuki Sasabe ◽  
Chihaya Adachi
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Hole Mobility ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Determining the exciton diffusion length of copper phthalocyanine in operating planar-heterojunction organic solar cells

2020 ◽  
Vol 89 (3) ◽  
pp. 30201 ◽  
Author(s):  
Xi Guan ◽  
Shiyu Wang ◽  
Wenxing Liu ◽  
Dashan Qin ◽  
Dayan Ban
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Copper Phthalocyanine ◽  
Short Circuit ◽  
Thick Layer ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Organic solar cells based on planar copper phthalocyanine (CuPc)/C60 heterojunction have been characterized, in which a 2 nm-thick layer of bathocuproine (BCP) is inserted into the CuPc layer. The thin layer of BCP allows hole current to tunnel it through but blocks the exciton diffusion, thereby altering the steady-state exciton profile in the CuPc zone (zone 1) sandwiched between BCP and C60. The short-circuit current density (JSC) of device is limited by the hole-exciton scattering effect at the BCP/CuPc (zone 1) interface. Based on the variation of JSC with the width of zone 1, the exciton diffusion length of CuPc is deduced to be 12.5–15 nm. The current research provides an easy and helpful method to determine the exciton diffusion lengths of organic electron donors.

Vertically Optimized Phase Separation with Improved Exciton Diffusion Enables High-Efficiency Organic Solar Cells with Thick Active Layers

2021 ◽  
Author(s):  
Yanming Sun ◽  
Yunhao Cai ◽  
Qian Li ◽  
Guanyu Lu ◽  
Hwa Sook Ryu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Diffusion Length ◽  
Active Layer Thickness ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Active Layers

Abstract The development of high-performance organic solar cells (OSCs) with thick active layers is of crucial importance for the roll-to-roll printing of large-area solar panels. Unfortunately, increasing the active layer thickness usually results in a significant reduction in efficiency. Herein, we fabricated efficient thick-film OSCs with an active layer consisting of one polymer donor and two non-fullerene acceptors. The two acceptors were found to possess enlarged exciton diffusion length in the mixed phase, which is beneficial to exciton generation and dissociation. Additionally, layer by layer approach was employed to optimize the vertical phase separation. Benefiting from the synergetic effects of enlarged exciton diffusion length and graded vertical phase separation, a record high efficiency of 17.31% (certified value of 16.9%) was obtained for the 300 nm-thick OSC, with an unprecedented short-circuit current density of 28.36 mA cm−2, and a high fill factor of 73.0%. Moreover, the device with an active layer thickness of 500 nm also shows a record efficiency of 15.21%. This work provides new insights into the fabrication of high-efficiency OSCs with thick active layers.

Phosphor-doping enhanced efficiency in bilayer organic solar cells due to longer exciton diffusion length

2014 ◽  
Vol 151 ◽  
pp. 193-196 ◽  
Author(s):  
Kang Xiong ◽  
Lintao Hou ◽  
Ping Wang ◽  
Yuxin Xia ◽  
Dongcheng Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

scholarly journals Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kui Jiang ◽  
Jie Zhang ◽  
Zhengxing Peng ◽  
Francis Lin ◽  
Shengfan Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Active Layer ◽  
Organic Solar Cells ◽  
High Performance ◽  
Diffusion Length ◽  
Bulk Heterojunction ◽  
Short Circuit ◽  
Full Potential ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

AbstractSolution-processed organic solar cells (OSCs) are a promising candidate for next-generation photovoltaic technologies. However, the short exciton diffusion length of the bulk heterojunction active layer in OSCs strongly hampers the full potential to be realized in these bulk heterojunction OSCs. Herein, we report high-performance OSCs with a pseudo-bilayer architecture, which possesses longer exciton diffusion length benefited from higher film crystallinity. This feature ensures the synergistic advantages of efficient exciton dissociation and charge transport in OSCs with pseudo-bilayer architecture, enabling a higher power conversion efficiency (17.42%) to be achieved compared to those with bulk heterojunction architecture (16.44%) due to higher short-circuit current density and fill factor. A certified efficiency of 16.31% is also achieved for the ternary OSC with a pseudo-bilayer active layer. Our results demonstrate the excellent potential for pseudo-bilayer architecture to be used for future OSC applications.

scholarly journals Large Crystalline Domains and an Enhanced Exciton Diffusion Length Enable Efficient Organic Solar Cells

2019 ◽  
Vol 31 (17) ◽  
pp. 6548-6557 ◽  
Author(s):  
Yiwei Zhang ◽  
Muhammad T. Sajjad ◽  
Oskar Blaszczyk ◽  
Andrew J. Parnell ◽  
Arvydas Ruseckas ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Crystalline Domains

Effect of molecular packing on the exciton diffusion length in organic solar cells

2007 ◽  
Vol 91 (17) ◽  
pp. 173504 ◽  
Author(s):  
Seung-Bum Rim ◽  
Reinhold F. Fink ◽  
Jan C. Schöneboom ◽  
Peter Erk ◽  
Peter Peumans
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Molecular Packing ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Measuring the exciton diffusion length of C60 in organic planar heterojunction solar cells

2011 ◽  
Vol 208 (8) ◽  
pp. 1967-1971 ◽  
Author(s):  
Dashan Qin ◽  
Peng Gu ◽  
Rudra Sankar Dhar ◽  
Seyed Ghasem Razavipour ◽  
Dayan Ban
Keyword(s):  
Solar Cells ◽  
Diffusion Length ◽  
Heterojunction Solar Cells ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Planar Heterojunction Solar Cells ◽  
Planar Heterojunction

Simulation of the Electrical Characteristics and Photon Absorption Profile of P3HT/PCBM Planar Hetero-junction Photovoltaic Cell

2018 ◽  
Vol 1 (2) ◽  
pp. 45
Author(s):  
Arin Dutta ◽  
Md. Abu Zaman ◽  
Fathema Farjana
Keyword(s):  
Solar Cell ◽  
Diffusion Length ◽  
Photovoltaic Cell ◽  
Photon Absorption ◽  
Maximum Power Density ◽  
Performance Parameters ◽  
Absorption Profile ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
20 Nm

In this research work, the performance parameters , such as fill factor (FF), external offquantum efficiency (EQE) , maximum power density and photon absorption profile of a planar hetero-junction poly 3-hexyl thiophene (P3HT) / phenyl-C61-butyric acid methyl ester (PCBM) photovoltaic cell has been simulated for different values of exciton diffusion length and thickness of donor layer where the simulation has been performed under the consideration of incident solar radiation of 1 kW/m2 irradiance , Air mass of 1.5, ambient temperature of 300K and Indium Tin Oxide (ITO) and Aluminium (Al) has been considered as the anode and cathode of the P3HT/PCBM solar cell respectively. The performance parameters and photon absorption profile of the P3HT/PCBM organic solar cell has been simulated for donor and acceptor layer thickness of 50, 60 and 70 nm and exciton diffusion length of 10, 15 and 20 nm . Finally, highest External Quantum Efficiency of 2.41% and Maximum Power Density of 24.10 W/m2 has been obtained for exciton diffusion length of 20 nm and donor thickness of 50 nm .

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