Triplet excitons: improving exciton diffusion length for enhanced organic photovoltaics

2019 ◽  
Vol 7 (6) ◽  
pp. 2445-2463 ◽  
Author(s):  
Bruno T. Luppi ◽  
Darren Majak ◽  
Manisha Gupta ◽  
Eric Rivard ◽  
Karthik Shankar
Keyword(s):  
Solar Cells ◽  
Organic Photovoltaics ◽  
Organic Materials ◽  
Diffusion Length ◽  
Future Research ◽  
Heavy Atoms ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Fundamental Limitation ◽  
Triplet Excitons

Organic materials containing heavy atoms have been used in photovoltaics to overcome a fundamental limitation: short exciton diffusion length (LD). We highlight studies showing increased LD in solar cells using triplet-generating materials and tackle challenges that the field faces with possible avenues for future research.

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.

scholarly journals Enhancing Exciton Diffusion Length Provides New Opportunities for Organic Photovoltaics

Matter ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 341-354
Author(s):  
Muhammad T. Sajjad ◽  
Arvydas Ruseckas ◽  
Ifor D.W. Samuel
Keyword(s):  
Organic Photovoltaics ◽  
Diffusion Length ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

The effects of heavy atoms on the exciton diffusion properties in photoactive thin films of tetrakis(4-carbomethoxyphenyl)porphyrins

2015 ◽  
Vol 3 (6) ◽  
pp. 1243-1249 ◽  
Author(s):  
Angy L. Ortiz ◽  
Graham S. Collier ◽  
Dawn M. Marin ◽  
Jennifer A. Kassel ◽  
Reynolds J. Ivins ◽  
...  
Keyword(s):  
Thin Films ◽  
Monte Carlo ◽  
Diffusion Coefficient ◽  
Diffusion Length ◽  
Heavy Atoms ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Quenching Efficiency ◽  
Diffusion Properties

The exciton diffusion coefficient (D) and exciton diffusion length (LD) for three tetrakis(4-carbomethoxyphenyl)porphyrins were obtained by fitting the quenching efficiency and PL lifetime to a 3D exciton Monte Carlo ediffusion model.

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 Long-range exciton diffusion in non-fullerene acceptors and coarse bulk heterojunctions enable highly efficient organic photovoltaics

2020 ◽  
Vol 8 (31) ◽  
pp. 15687-15694
Author(s):  
Muhammad T. Sajjad ◽  
Arvydas Ruseckas ◽  
Lethy Krishnan Jagadamma ◽  
Yiwei Zhang ◽  
Ifor D. W. Samuel
Keyword(s):  
Long Range ◽  
Organic Photovoltaics ◽  
Diffusion Length ◽  
Three Dimensional ◽  
Accurate Estimate ◽  
Bulk Heterojunctions ◽  
Time Resolved ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length ◽  
Time Resolved Photoluminescence

Time-resolved photoluminescence measurements provide an accurate estimate of the three-dimensional exciton diffusion length in three ITICs based non-fullerene acceptors (NFAs).

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
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