Investigation of Energy Transfer in Organic Photovoltaic Cells and Impact on Exciton Diffusion Length Measurements

In this article, we developed a new nano spectroscopic technique, peak force visible (PF-vis) microscopy, which is based on the peak force tapping mode in an atomic force microscope to both visualize nanoscale morphology and estimate exciton diffusion lengths of donor domains in organic photovoltaic blends. Nano phase-separations in P3HT:PCBM and TFB:PCBM blend films were clearly revealed by PF-vis microscopy with a high spatial resolution less than 10 nm. A model that correlates PF-vis signal and the exciton diffusion length was also developed to estimate the diffusion lengths of P3HT and TFB to be 2.9±0.3 and 9.0±1.5 nm, respectively. PF-vis microscopy is expected to assist the evaluation of OPV materials, therefore accelerating the pace of innovation of OPVs.

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Universal description of exciton diffusion length in organic photovoltaic cell

Organic Electronics ◽

10.1016/j.orgel.2015.04.006 ◽

2015 ◽

Vol 23 ◽

pp. 53-56 ◽

Cited By ~ 9

Author(s):

Guangwei Xu ◽

Nianduan Lu ◽

Wei Wang ◽

Nan Gao ◽

Zhuoyu Ji ◽

...

Keyword(s):

Diffusion Length ◽

Photovoltaic Cell ◽

Organic Photovoltaic ◽

Organic Photovoltaic Cell ◽

Exciton Diffusion ◽

Exciton Diffusion Length

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Peak Force Visible Microscopy for Determination of Exciton Diffusion Length in Organic Photovoltaic Blends

10.26434/chemrxiv.7077872 ◽

2018 ◽

Author(s):

Haomin Wang ◽

Le Wang ◽

Yuequn Shang ◽

Zhijun Ning ◽

Xiaoji Xu

Keyword(s):

Diffusion Length ◽

Spectroscopic Technique ◽

Peak Force ◽

Organic Photovoltaic ◽

Phase Separations ◽

Blend Films ◽

Exciton Diffusion ◽

Exciton Diffusion Length ◽

Atomic Force

In this article, we developed a new nano spectroscopic technique, peak force visible (PF-vis) microscopy, which is based on the peak force tapping mode in an atomic force microscope to both visualize nanoscale morphology and estimate exciton diffusion lengths of donor domains in organic photovoltaic blends. Nano phase-separations in P3HT:PCBM and TFB:PCBM blend films were clearly revealed by PF-vis microscopy with a high spatial resolution less than 10 nm. A model that correlates PF-vis signal and the exciton diffusion length was also developed to estimate the diffusion lengths of P3HT and TFB to be 2.9±0.3 and 9.0±1.5 nm, respectively. PF-vis microscopy is expected to assist the evaluation of OPV materials, therefore accelerating the pace of innovation of OPVs.

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Required Equipment for Photo-Switchable Donor-Acceptor (D-A) Dyad Interfacial Self-Assembled Monolayers for Organic Photovoltaic Cells

10.21236/ada594608 ◽

2014 ◽

Author(s):

Luis Echegoyen

Keyword(s):

Photovoltaic Cells ◽

Organic Photovoltaic ◽

Self Assembled Monolayers ◽

Organic Photovoltaic Cells ◽

Assembled Monolayers ◽

Donor Acceptor ◽

Self Assembled

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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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