Semi-crystalline photovoltaic polymers with efficiency exceeding 9% in a ∼300 nm thick conventional single-cell device
Thanh Luan Nguyen,Hyosung Choi,Seo-Jin Ko,Mohammad Afsar Uddin,Bright Walker,Seungjib Yum,Ji Eun Jeong,Myoung Hee Yun,Tae Joo Shin,Seongyeon Hwang,Jin Young Kim,Han Young Woo +11 more
TLDR
In this paper, a series of semi-crystalline, low band gap (LBG) polymers and demonstrate the fabrication of highly efficient polymer solar cells (PSCs) in a thick single-cell architecture.Abstract:
We report a series of semi-crystalline, low band gap (LBG) polymers and demonstrate the fabrication of highly efficient polymer solar cells (PSCs) in a thick single-cell architecture. The devices achieve a power conversion efficiency (PCE) of over 7% without any post-treatment (annealing, solvent additive, etc.) and outstanding long-term thermal stability for 200 h at 130 °C. These excellent characteristics are closely related to the molecular structures where intra- and/or intermolecular noncovalent hydrogen bonds and dipole–dipole interactions assure strong interchain interactions without losing solution processability. The semi-crystalline polymers form a well-distributed nano-fibrillar networked morphology with PC70BM with balanced hole and electron mobilities (a h/e mobility ratio of 1–2) and tight interchain packing (a π–π stacking distance of 3.57–3.59 A) in the blend films. Furthermore, the device optimization with a processing additive and methanol treatment improves efficiencies up to 9.39% in a ∼300 nm thick conventional single-cell device structure. The thick active layer in the PPDT2FBT:PC70BM device attenuates incident light almost completely without damage in the fill factor (0.71–0.73), showing a high short-circuit current density of 15.7–16.3 mA cm−2. Notably, PPDT2FBT showed negligible changes in the carrier mobility even at ∼1 μm film thickness.read more
Citations
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Fast charge separation in a non-fullerene organic solar cell with a small driving force
Jing Liu,Shangshang Chen,Deping Qian,Bhoj Gautam,Guofang Yang,Guofang Yang,Jingbo Zhao,Jonas Bergqvist,Fengling Zhang,Wei Ma,Harald Ade,Olle Inganäs,Kenan Gundogdu,Feng Gao,He Henry Yan +14 more
TL;DR: In this article, fast and efficient charge separation is essential to achieve high power conversion efficiency in organic solar cells (OSCs), and in state-of-the-art OSCs, this is usually achieved by a significant driv
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Organic Optoelectronic Materials: Mechanisms and Applications
TL;DR: The article reviews the current understanding of the physical mechanisms that determine the (opto)electronic properties of high-performance organic materials and highlights the capabilities of various experimental techniques for characterization, summarizes top-of-the-line device performance, and outlines recent trends in the further development of the field.
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Over 14% Efficiency in Polymer Solar Cells Enabled by a Chlorinated Polymer Donor.
TL;DR: This work establishes a more economical design paradigm of replacing fluorine with chlorine for preparing highly efficient polymer donors and exhibits higher open circuit voltage than the PBDB-T-2Cl-based PSCs, leading to an outstanding power conversion efficiency of over 14%.
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A Large‐Bandgap Conjugated Polymer for Versatile Photovoltaic Applications with High Performance
TL;DR: A new copolymer PM6 based on fluorothienyl-substituted benzodithiophene is synthesized and characterized, and the inverted polymer solar cells based on PM6 exhibit excellent performance and power conversion efficiency.
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Stability of organic solar cells: challenges and strategies
Pei Cheng,Xiaowei Zhan +1 more
TL;DR: The factors limiting the stability of OSCs are summarized, such as metastable morphology, diffusion of electrodes and buffer layers, oxygen and water, irradiation, heating and mechanical stress, and recent progress in strategies to increase the stability are surveyed.
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