Search query: organic solar cell

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abstract: Summary Recently, non fullerene n type organic semiconductors have attracted significant attention as acceptors in organic photovoltaics (OPVs) due to their great potential to realize high power conversion efficiencies. The rational design of the central fused ring unit of these acceptor molecules is crucial to maximize device performance. Here, we report a new class of non fullerene acceptor, Y6, that employs a ladder type electron deficient core based central fused ring (dithienothiophen[3.2 b] pyrrolobenzothiadiazole) with a benzothiadiazole (BT) core to fine tune its absorption and electron affinity. OPVs made from Y6 in conventional and inverted architectures each exhibited a high efficiency of 15.7% measured in two separate labs. Inverted device structures were certified at Enli Tech Laboratory demonstrated an efficiency of 14.9% We further observed that the Y6 based devices maintain a high efficiency of 13.6% with an active layer thickness of 300 nm. The electron deficient core based fused ring reported in this work opens a new door in the molecular design of high performance acceptors for OPVs.
author_names: Jun Yuan

Yunqiang Zhang

Liuyang Zhou

Guichuan Zhang

Hin-Lap Yip

Tsz-Ki Lau

Xinhui Lu

Can Zhu

Hongjian Peng

Paul A Johnson

Mario Leclerc

Yong Cao

Jacek Ulanski

Yongfang Li

Yingping Zou
title: Single Junction Organic Solar Cell with over 15% Efficiency Using Fused Ring Acceptor with Electron Deficient Core
venue: Joule
year: 2019

abstract: phenylenevinylene)s L4. Fluorene Based Conjugated Polymers L4.1. Fluorene Based Copolymers ContainingElectron Rich MoietiesM4.2. Fluorene Based Copolymers ContainingElectron Deficient MoietiesN4.3. Fluorene Based Copolymers ContainingPhosphorescent ComplexesQ5. Carbazole Based Conjugated Polymers R5.1. Poly(2,7 carbazole) Based Polymers R5.2. Indolo[3,2
author_names: Yen-Ju Cheng

Sheng-Hsiung Yang

Chain-Shu Hsu
title: Synthesis of conjugated polymers for organic solar cell applications.
venue: Chemical reviews
year: 2009

abstract: Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well studied properties, a stronger intramolecular electron push pull effect also affords other advantages in nonfullerene acceptors. A strong push pull effect improves the dipole moment of the wings in IT 4F over IT M and results in a lower miscibility than IT M when blended with PBDB TF. This feature leads to higher domain purity in the PBDB TF:IT 4F blend and makes a contribution to the better photovoltaic performance. Moreover, the strong push pull effect also decreases the vibrational relaxation, which makes IT 4F more promising than IT M in reducing the energetic loss of organic solar cells. Above all, a power conversion efficiency of 13.7% is recorded in PBDB TF:IT 4F based devices.
author_names: Wanning Li

Long Ye

Sunsun Li

Huifeng Yao

Harald W Ade

Jianhui Hou
title: A High Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push Pull Effect of the Nonfullerene Acceptor.
venue: Advanced materials
year: 2018

abstract: Fast and efficient charge separation is essential to achieve high power conversion efficiency in organic solar cells (OSCs) In state of the art OSCs, this is usually achieved by a significant driv
author_names: Jiajun Liu

Shangshang Chen

Deping Qian

Bhoj Gautam

Guofang Yang

Jingbo Zhao

Jonas Bergqvist

Fengling Zhang

Wei Ma

Harald W Ade

Olle Inganas

Kenan Gundogdu

Feng Gao

He Yan
title: Fast charge separation in a non fullerene organic solar cell with a small driving force
year: 2016

abstract: Fabricating organic solar cells (OSCs) with a tandem structure has been considered an effective method to overcome the limited light absorption spectra of organic photovoltaic materials. Currently, the most efficient tandem OSCs are fabricated by adopting fullerene derivatives as acceptors. In this work, we designed a new non fullerene acceptor with an optical band gap (Egopt) of 1.68 eV for the front subcells and optimized the phase separation morphology of a fullerene free active layer with an Egopt of 1.36 eV to fabricate the rear subcell. The two subcells show a low energy loss and high external quantum efficiency, and their photoresponse spectra are complementary. In addition, an interconnection layer (ICL) composed of ZnO and a pH neutral self doped conductive polymer, PCP Na, with high light transmittance in the near IR range was developed. From the highly optimized subcells and ICL, solution processed fullerene free tandem OSCs with an average power conversion efficiency (PCE) greater than 13% were obtained.
author_names: Yong Cui

Huifeng Yao

Bowei Gao

Yunpeng Qin

Shaoqing Zhang

Bei Yang

Chang He

Bowei Xu

Jianhui Hou
title: Fine Tuned Photoactive and Interconnection Layers for Achieving over 13% Efficiency in a Fullerene Free Tandem Organic Solar Cell.
venue: Journal of the American Chemical Society
year: 2017

abstract: Bulk heterojunction organic solar cells (OSCs) have received considerable attention with significant progress recently and offer a promising outlook for portable energy resources and building integrated photovoltaics in the future. Now, it is urgent to promote the research of OSCs toward their commercialization. For the commercial application of OSCs, it is of great importance to develop high performance, high stability, and low cost photovoltaic materials. In this review, a comprehensive overview of the fundamental requirements of photoactive layer materials and interface layer materials toward commercialization is provided, mainly focusing on high performance, green manufacturing, simplifying device fabrication processes, stability, and cost issues. Furthermore, the perspectives and opportunities for this emerging field of materials science and engineering are also discussed.
author_names: Rongming Xue

Jingwen Zhang

Yaowen Li

Yongfang Li
title: Organic Solar Cell Materials toward Commercialization.
venue: Small
year: 2018

abstract: Ternary organic solar cells (OSCs) have attracted much research attention in the past few years, as ternary organic blends can broaden the absorption range of OSCs without the use of complicated tandem cell structures. Despite their broadened absorption range, the light harvesting capability of ternary OSCs is still limited because most ternary OSCs use thin active layers of about 100 nm in thickness, which is not sufficient to absorb all photons in their spectral range and may also cause problems for future roll to roll mass production that requires thick active layers. In this paper, we report a highly efficient ternary OSC (11.40% obtained by incorporating a nematic liquid crystalline small molecule (named benzodithiophene terthiophene rhodanine (BTR) into a state of the art PTB7 Th:PC71BM binary system. The addition of BTR into PTB7 Th:PC71BM was found to improve the morphology of the blend film with decreased p p stacking distance, enlarged coherence length, and enhanced domain purity. This resulted in more efficient charge separation, faster charge transport, and less bimolecular recombination, which, when combined, led to better device performance even with thick active layers. Our results show that the introduction of highly crystalline small molecule donors into ternary OSCs is an effective means to enhance the charge transport and thus increase the active layer thickness of ternary OSCs to make them more suitable for roll to roll production than previous thinner devices.
author_names: Guichuan Zhang

Kai Zhang

Qingwu Yin

Xiao-Fang Jiang

Zaiyu Wang

Jingming Xin

Wei Ma

He Yan

Fei Huang

Yong Cao
title: High Performance Ternary Organic Solar Cell Enabled by a Thick Active Layer Containing a Liquid Crystalline Small Molecule Donor.
venue: Journal of the American Chemical Society
year: 2017

abstract: Fullerene free organic solar cells show over 11% power conversion efficiency, processed by low toxic solvents. The applied donor and acceptor in the bulk heterojunction exhibit almost the same highest occupied molecular orbital level, yet exhibit very efficient charge creation.
author_names: Zhong Zheng

Omar M Awartani

Bhoj Gautam

Delong Liu

Yunpeng Qin

Wanning Li

A Bataller

Kenan Gundogdu

Harald W Ade

Jianhui Hou
title: Efficient Charge Transfer and Fine Tuned Energy Level Alignment in a THF Processed Fullerene Free Organic Solar Cell with 11.3% Efficiency.
venue: Advanced materials
year: 2017

abstract: A comparison of the efficiency, stability, and photophysics of organic solar cells employing poly[(5,6 difluoro 2,1,3 benzothiadiazol 4,7 diyl) alt (3,3' di(2 octyldodecyl) 2,2';5',2';5',2' quaterthiophen 5,5' diyl) (PffBT4T 2OD) as a donor polymer blended with either the nonfullerene acceptor EH IDTBR or the fullerene derivative, [6,6] phenyl C71 butyric acid methyl ester (PC71 BM) as electron acceptors is reported. Inverted PffBT4T 2OD:EH IDTBR blend solar cell fabricated without any processing additive achieves power conversion efficiencies (PCEs) of 9.5 0.2% The devices exhibit a high open circuit voltage of 1.08 0.01 V, attributed to the high lowest unoccupied molecular orbital (LUMO) level of EH IDTBR. Photoluminescence quenching and transient absorption data are employed to elucidate the ultrafast kinetics and efficiencies of charge separation in both blends, with PffBT4T 2OD exciton diffusion kinetics within polymer domains, and geminate recombination losses following exciton separation being identified as key factors determining the efficiency of photocurrent generation. Remarkably, while encapsulated PffBT4T 2OD:PC71 BM solar cells show significant efficiency loss under simulated solar irradiation "burn in" degradation) due to the trap assisted recombination through increased photoinduced trap states, PffBT4T 2OD:EH IDTBR solar cell shows negligible burn in efficiency loss. Furthermore, PffBT4T 2OD:EH IDTBR solar cells are found to be substantially more stable under 85 degC thermal stress than PffBT4T 2OD:PC71 BM devices.
author_names: Hyojung Cha

Jiaying Wu

Andrew Wadsworth

Jade Nagitta

Saurav Limbu

Sebastian Pont

Zhe Li

Justin R Searle

Mark F Wyatt

Derya Baran

Ji-seon Kim

Iain McCulloch

James R Durrant
title: An Efficient, "Burn in" Free Organic Solar Cell Employing a Nonfullerene Electron Acceptor.
venue: Advanced materials
year: 2017

abstract: Abstract Carbazole based molecules are more important in organic solar cell (OSC) applications, because carbazole derivatives have more thermal stability, high hole transporting property, more electron rich (p type) material, higher photoconductivity, and better chemical stability. This review deals with bulk heterojunction organic solar cell (BHJ OSC) devices, structures, working principle, device characterization, perovskite type solar cell, and studies of the photovoltaic performance of carbazole based derivatives such as 2,7 carbazole, indolo[3,2 b ]carbazole containing donors (D) coupled with various acceptors (A) namely benzothiadiazole, thiazolothiazole, diketopyrrolopyrrole, and quinoxaline that are reported during the last decade and also dye sensitized solar cell (DSSC) performance of carbazole derivatives. We will briefly outline the relationship between the structure and power conversion efficiencies (PCEs)
author_names: Govindasamy Sathiyan

E K T Sivakumar

Ramasamy Ganesamoorthy

Rangasamy Thangamuthu

Pachagoundar Sakthivel
title: Review of carbazole based conjugated molecules for highly efficient organic solar cell application
year: 2016