Influence of Temperature on Exciton Dynamic Processes in CuPc/C60 Based Solar Cells

Although the effect of high temperature on the performance of organic solar cells has been widely investigated, it is inevitably influenced by the associated annealing effect (which usually leads to film morphology change and variation in electrical properties), which makes the discussion more sophisticated. In this study, we simplified the issue and investigated the influence of low temperatures (from room temperature to 77 K) on the photocurrent and internal/external quantum efficiency of a CuPc/C60 based solar cell. We found that besides the charge dynamic process (charge transport), one or more of the exciton dynamic processes, such as exciton diffusion and exciton dissociation, also play a significant role in affecting the photocurrent of organic solar cells at different temperatures. Additionally, the results showed that the temperature had negligible influence on the absorption of the CuPc film as well as the exciton generation process, but obviously influenced the other two exciton dynamic processes (exciton diffusion and exciton dissociation).

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

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020190322 ◽

2020 ◽

Vol 89 (3) ◽

pp. 30201 ◽

Cited By ~ 1

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.

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Unraveling the Temperature Dependence of Exciton Dissociation and Free Charge Generation in Nonfullerene Organic Solar Cells

Solar RRL ◽

10.1002/solr.202000789 ◽

2021 ◽

Vol 5 (4) ◽

pp. 2000789

Author(s):

Chao Ma ◽

Christopher C. S. Chan ◽

Xinhui Zou ◽

Han Yu ◽

Jianquan Zhang ◽

...

Keyword(s):

Solar Cells ◽

Temperature Dependence ◽

Organic Solar Cells ◽

Free Charge ◽

Exciton Dissociation ◽

Charge Generation

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Highly efficient organic solar cells based on a robust room-temperature solution-processed copper iodide hole transporter

Nano Energy ◽

10.1016/j.nanoen.2015.07.018 ◽

2015 ◽

Vol 16 ◽

pp. 458-469 ◽

Cited By ~ 28

Author(s):

Kui Zhao ◽

Guy O. Ngongang Ndjawa ◽

Lethy Krishnan Jagadamma ◽

Abdulrahman El Labban ◽

Hanlin Hu ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Room Temperature ◽

Copper Iodide ◽

Solution Processed ◽

Highly Efficient ◽

Temperature Solution

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

10.21203/rs.3.rs-952325/v1 ◽

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.

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Cold Isostatic-Pressured Silver Nanowire Electrodes for Flexible Organic Solar Cells via Room-Temperature Processes

Advanced Materials ◽

10.1002/adma.201701479 ◽

2017 ◽

Vol 29 (30) ◽

pp. 1701479 ◽

Cited By ~ 59

Author(s):

Ji Hoon Seo ◽

Inchan Hwang ◽

Han-Don Um ◽

Sojeong Lee ◽

Kangmin Lee ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Room Temperature ◽

Silver Nanowire ◽

Flexible Organic Solar Cells

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Diffusion-enhanced exciton dissociation in single-material organic solar cells

Physical Chemistry Chemical Physics ◽

10.1039/d1cp03328j ◽

2021 ◽

Vol 23 (37) ◽

pp. 20848-20853

Author(s):

Nong V. Hoang ◽

Vasileios C. Nikolis ◽

Lukasz Baisinger ◽

Koen Vandewal ◽

Maxim S. Pshenichnikov

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Domain Boundary ◽

Exciton Dissociation ◽

Dissociation Efficiency ◽

Single Material

Multiple crossings at the domain boundary with different molecular orientations enhance the exciton dissociation efficiency in single-material organic solar cells.

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A New Buffering Layer of Photovoltaic Solar Cells

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.482-484.394 ◽

2012 ◽

Vol 482-484 ◽

pp. 394-397

Author(s):

Ming Wei Li ◽

Nan Hai Sun ◽

Yun Wang Ge ◽

Bo Lei Yao

Keyword(s):

Thin Film ◽

Solar Cells ◽

Organic Solar Cells ◽

Room Temperature ◽

Acid Methyl Ester ◽

Good Alternative ◽

Oxide Thin Film ◽

Nio Thin Film ◽

Temperature Deposition ◽

Photovoltaic Solar Cells

This paper presents a new buffering layer(nickle oxide thin film) of organic solar cells. Nickle Oxide(NiO) thin film is a good alternative of hole tansporting layer. We investigates the film from physical and electrical aspects, such as morphology, deposition temperature, thickness etc. We find that the optimum fabrication conditions are: room temperature deposition, 10nm of thickness, and 30% oxygen proportion. The device strcture is Anode/NiO/P3HT[regioregular of poly(3-hexylthiophene)]: PCBM[(6,6)-phenyl C61 butyric acid methyl ester] /Al. And the best power conversion efficiency of device we got with NiO buffering layer is 2.49%, which is hundred times of ones without NiO buffering layer.

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