Molecular Multilayer Organic Solar Cells with Large Excitonic Diffusion Length

2006 ◽  
Vol 965 ◽  
Author(s):  
Seunghyup Yoo ◽  
William J Potscavage ◽  
Benoit Domercq ◽  
Sung-Ho Han ◽  
Dean Levi ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Performance Improvement ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Collection Efficiency ◽  
Blocking Layer ◽  
Photovoltaic Properties ◽  
Optical Functions ◽  
Carrier Collection

ABSTRACTWe report on the photovoltaic properties of organic solar cells based on pentacene and C60 thin films. A peak external quantum efficiency (EQE) of 69 % at a wavelength of λ = 668 nm is achieved upon optimization of the exciton blocking layer (EBL) thickness. Complex optical functions of pentacene films are measured as a function of wavelength by spectroscopic ellipsometry and used to analyze the EQE spectra. Detailed analysis of the EQE spectra indicate that the pentacene layers exhibit large excitonic diffusion lengths of ∼70 nm and that the performance improvement in EQE can be attributed to the influence of the thickness of the EBL layer on the carrier collection efficiency.

Solution processed thin films of Nb-doped TiO2 nanoparticles as hole blocking layer for organic solar cells

2014 ◽  
Vol 553 ◽  
pp. 161-165 ◽  
Author(s):  
Wonmok Lee ◽  
Incheol Kim ◽  
Ilwoo Ok ◽  
Dahee Ahn ◽  
Hyunjung Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Tio2 Nanoparticles ◽  
Organic Solar Cells ◽  
Blocking Layer ◽  
Solution Processed ◽  
Doped Tio2 ◽  
Hole Blocking Layer

Optimization of Organic Solar Cells and Photodetectors Based on Pentacene Thin Films

2005 ◽  
Vol 871 ◽  
Author(s):  
S. Yoo ◽  
B. Domercq ◽  
B. Kippelen
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Light Intensity ◽  
Equivalent Circuit ◽  
Organic Solar Cells ◽  
Equivalent Circuit Model ◽  
Circuit Model ◽  
Shunt Resistance ◽  
Photovoltaic Properties

AbstractWe report on the photovoltaic properties of efficient multilayer devices based on pentacene thin films as a function of light intensity. Light-induced effects are characterized by the refined equivalent circuit model which incorporates an additional shunt resistance and an additional diode whose properties are function of the light intensity. Relative effects of these intensity-dependent parameters as well as the route to further optimization are discussed.

Analysis of improved photovoltaic properties of pentacene/C60 organic solar cells: Effects of exciton blocking layer thickness and thermal annealing

2007 ◽  
Vol 51 (10) ◽  
pp. 1367-1375 ◽  
Author(s):  
Seunghyup Yoo ◽  
William J. Potscavage ◽  
Benoit Domercq ◽  
Sung-Ho Han ◽  
Tai-De Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Layer Thickness ◽  
Thermal Annealing ◽  
Organic Solar Cells ◽  
Blocking Layer ◽  
Photovoltaic Properties

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.

Unveiling the crystalline packing of Y6 in thin films by thermal induced “backbone-on” orientation

2021 ◽  
Author(s):  
Yiqun Xiao ◽  
Jun Yuan ◽  
Guodong Zhou ◽  
Ka Chak Ngan ◽  
Xinxin Xia ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Molecular Packing

Researchers are endeavoring to decode the fundamental reasons for the non-fullerene acceptor, Y6, to deliver high-performance organic solar cells. In this manuscript, we tackle this problem from the molecular packing...

Eco-Friendly AgBiS2 Nanocrystal/ZnO Nanowire Heterojunction Solar Cells with Enhanced Carrier Collection Efficiency

2021 ◽  
Vol 13 (3) ◽  
pp. 3969-3978
Author(s):  
Yun Xiao ◽  
Haibin Wang ◽  
Fumiyasu Awai ◽  
Naoyuki Shibayama ◽  
Takaya Kubo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Collection Efficiency ◽  
Zno Nanowire ◽  
Heterojunction Solar Cells ◽  
Carrier Collection

14.7% all-small-molecule organic solar cells enabled with fullerene derivative incorporation

2021 ◽  
Author(s):  
Hu Dingqin ◽  
Hua Tang ◽  
Haiyan Chen ◽  
Jie Lv ◽  
Shirong Lu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Fullerene Derivative ◽  
Photovoltaic Properties

Ternary strategy is promising to enhance the photovoltaic properties of organic solar cells (OSCs). Nevertheless, it is full of challenging when this approach involving only small molecule. Herein, a fullerene...

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.

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