scholarly journals All-Polymer Solar Cells Based on Fully Conjugated Donor-Acceptor Block Copolymers with Poly(naphthalene bisimide) Acceptor Blocks: Device Performance and Thin Film Morphology

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Kazuhiro Nakabayashi ◽  
Hideharu Mori
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Polymer Solar Cells ◽  
Grazing Incidence ◽  
Open Circuit ◽  
Device Performance ◽  
Film Morphology ◽  
Force Microscopy ◽  
Donor And Acceptor ◽  
Donor Acceptor

All-polymer solar cells are fabricated by using poly(3-hexylthiophene) (P3HT) and fully conjugated donor-acceptor (D-A) block copolymer (P3HT-PNBI-P3HT) as donor and acceptor materials, respectively. Atomic force microscopy (AFM) and grazing incidence wide angle X-ray scattering (GIWAXS) analyses reveal that device performance strongly depends on the P3HT:P3HT-PNBI-P3HT thin film morphology. Indeed, theπ-πstacking nanomorphology rich in the edge-on orientation is formed in the P3HT:P3HT-PNBI-P3HT thin film by optimizing the fabrication conditions, for example, thermal annealing temperature and cast solvent. Consequently, the power conversion efficiency (PCE) of 1.60% is achieved with an open-circuit voltage (Voc) of 0.59 V, short-current (Jsc) of 4.43 mA/cm2, and fill factor (FF) of 0.61. These results suggest that P3HT-PNBI-P3HT has the huge potential for the usage as a nonfullerene acceptor material.

scholarly journals High-Performance Ternary Organic Solar Cells Enabled by Synergizing Fullerene and Non-Fullerene Acceptors

2021 ◽  
Author(s):  
Yuanyuan Jiang ◽  
Xiaozhang Zhu
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
High Performance ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Device Performance ◽  
Film Morphology ◽  
Charge Dynamics

With the development of the non-fullerene acceptor (NFA), the use of ternary organic photovoltaic devices based on a fullerene acceptor and a NFA is now widespread, and the merits of both acceptor types can be fully utilized. However, the effective approach of enhancing device performance is adjusting the charge dynamics and the thin-film morphology of the active layer via introducing the second acceptor, which would significantly impact the open-circuit voltage, the short-circuit current, and the fill factor, thus strongly affecting device efficiency. The functions of the second acceptor in a ternary organic solar cell with a fullerene acceptor and a NFA are summarized here. These include a broader absorption spectrum; formation of a cascade energy level or energy transfer; modified thin-film morphology including phase separation, effects on crystallinity, size, and purity of domain; and vertical distribution along with improved charge dynamics like exciton dissociation and charge transport, collection, and recombination. Then, we discuss the hierarchical morphology in ternary solar cells may benefit device performance and the outlook of the ternary device.

A double B←N bridged bipyridine (BNBP)-based polymer electron acceptor: all-polymer solar cells with a high donor : acceptor blend ratio

2017 ◽  
Vol 1 (5) ◽  
pp. 852-858 ◽  
Author(s):  
Xiaojing Long ◽  
Zicheng Ding ◽  
Chuandong Dou ◽  
Jun Liu ◽  
Lixiang Wang
Keyword(s):  
Solar Cells ◽  
Electron Donor ◽  
Electron Acceptor ◽  
Polymer Solar Cells ◽  
Device Performance ◽  
Blend Ratio ◽  
Donor Acceptor ◽  
Blend Ratios ◽  
High Donor

All-polymer solar cells with P3HT as an electron donor exhibit good device performance with high donor : acceptor blend ratios (w : w, from 0.5 : 1 to 9 : 1).

Morphological optimization by rational matching of the donor and acceptor boosts the efficiency of alkylsilyl fused ring-based polymer solar cells

2019 ◽  
Vol 7 (9) ◽  
pp. 4847-4854 ◽  
Author(s):  
Bin Huang ◽  
Lin Hu ◽  
Lie Chen ◽  
Shanshan Chen ◽  
Ming Hu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Active Layer ◽  
Polymer Solar Cells ◽  
Device Performance ◽  
Donor And Acceptor ◽  
Fused Ring

Revealing the basic matching principle of the donor and acceptor for optimizing the active layer morphology and improving the device performance.

scholarly journals The Effects of ZnTe:Cu Back Contact on the Performance of CdTe Nanocrystal Solar Cells with Inverted Structure

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 626 ◽  
Author(s):  
Bingchang Chen ◽  
Junhong Liu ◽  
Zexin Cai ◽  
Ao Xu ◽  
Xiaolin Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Contact Layer ◽  
Open Circuit ◽  
Band Alignment ◽  
Device Performance ◽  
Back Contact ◽  
Device Structure ◽  
Inverted Structure ◽  
Cdte Nanocrystal

CdTe nanocrystal (NC) solar cells have received much attention in recent years due to their low cost and environmentally friendly fabrication process. Nowadays, the back contact is still the key issue for further improving device performance. It is well known that, in the case of CdTe thin-film solar cells prepared with the close-spaced sublimation (CSS) method, Cu-doped CdTe can drastically decrease the series resistance of CdTe solar cells and result in high device performance. However, there are still few reports on solution-processed CdTe NC solar cells with Cu-doped back contact. In this work, ZnTe:Cu or Cu:Au back contact layer (buffer layer) was deposited on the CdTe NC thin film by thermal evaporation and devices with inverted structure of ITO/ZnO/CdSe/CdTe/ZnTe:Cu (or Cu)/Au were fabricated and investigated. It was found that, comparing to an Au or Cu:Au device, the incorporation of ZnTe:Cu as a back contact layer can improve the open circuit voltage (Voc) and fill factor (FF) due to an optimized band alignment, which results in enhanced power conversion efficiency (PCE). By carefully optimizing the treatment of the ZnTe:Cu film (altering the film thickness and annealing temperature), an excellent PCE of 6.38% was obtained, which showed a 21.06% improvement compared with a device without ZnTe:Cu layer (with a device structure of ITO/ZnO/CdSe/CdTe/Au).

Synthesis of 1,3,4-thiadiazole-based donor–acceptor alternating copolymers for polymer solar cells with high open-circuit voltage

2015 ◽  
Vol 47 (7) ◽  
pp. 513-521 ◽  
Author(s):  
Seijiro Fukuta ◽  
Zhongqiang Wang ◽  
Satoshi Miyane ◽  
Tomoyuki Koganezawa ◽  
Takeshi Sano ◽  
...  
Keyword(s):  
Solar Cells ◽  
Open Circuit Voltage ◽  
Polymer Solar Cells ◽  
Open Circuit ◽  
Alternating Copolymers ◽  
Donor Acceptor

Effects of Bithiophene Imide Fusion on the Device Performance of Organic Thin-Film Transistors and All-Polymer Solar Cells

2017 ◽  
Vol 129 (48) ◽  
pp. 15506-15510 ◽  
Author(s):  
Yingfeng Wang ◽  
Zhenglong Yan ◽  
Han Guo ◽  
Mohammad Afsar Uddin ◽  
Shaohua Ling ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Thin Film Transistors ◽  
Polymer Solar Cells ◽  
Organic Thin Film Transistors ◽  
Device Performance ◽  
Organic Thin Film

HOMO energy level regulation of novel conjugated copolymers for polymer solar cells

2015 ◽  
Vol 39 (8) ◽  
pp. 6548-6554 ◽  
Author(s):  
Jianfeng Zhang ◽  
Sheyu Wang ◽  
Qida Liu ◽  
Zhiyang Liu ◽  
Ruixiang Peng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Open Circuit Voltage ◽  
Polymer Solar Cells ◽  
Open Circuit ◽  
Spectral Absorption ◽  
Homo Energy ◽  
Donor Acceptor ◽  
Homo Energy Level ◽  
Conjugated Copolymers

Novel donor–acceptor conjugated copolymers were synthesized, and the HOMOs were regulated to high open circuit voltage and wide spectral absorption.

Temperature dependent behavior of flat and bulk heterojunction organic solar cells

2013 ◽  
Vol 1493 ◽  
pp. 269-273 ◽  
Author(s):  
Johannes Widmer ◽  
Karl Leo ◽  
Moritz Riede
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Qualitative Difference ◽  
Open Circuit ◽  
Illumination Intensity ◽  
Zinc Phthalocyanine ◽  
Dependent Behavior ◽  
Donor And Acceptor ◽  
Donor Acceptor

ABSTRACTThe open-circuit voltage of an organic solar cell is increasing with decreasing temperature and with increasing illumination intensity. These dependencies are quantitatively investigated for two types of organic solar cells, one with a flat donor-acceptor heterojunction and one with a mixed layer bulk heterojunction. Zinc-phthalocyanine and C60 are used as donor and acceptor, respectively. A qualitative difference is found for the two geometries. We find that a logarithmic illumination intensity dependence with temperature as a linear pre-factor of the logarithm, which is commonly reported and observed, is applicable for the bulk heterojunction. The flat heterojunction, in contrast, shows a constant illumination intensity pre-factor which is independent of the temperature, and the temperature can be modeled as additional linear summand.

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