Morphology-performance relationships in polymer/fullerene blends probed by complementary characterisation techniques – effects of nanowire formation and subsequent thermal annealing

2015 ◽  
Vol 3 (35) ◽  
pp. 9224-9232 ◽  
Author(s):  
Jong Soo Kim ◽  
Sebastian Wood ◽  
Safa Shoaee ◽  
Steve J. Spencer ◽  
Fernando A. Castro ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Thermal Annealing ◽  
Organic Solar Cells ◽  
Film Morphology ◽  
Polymer Nanowires ◽  
Subsequent Thermal Annealing ◽  
Characterisation Techniques

Polymer nanowires are used to form organic solar cells, and the development of the thin film morphology during thermal annealing is characterised in detail.

scholarly journals A helical perylene diimide-based acceptor for non-fullerene organic solar cells: synthesis, morphology and exciton dynamics

2018 ◽  
Vol 5 (5) ◽  
pp. 172041 ◽  
Author(s):  
Li Chen ◽  
Mingliang Wu ◽  
Guangwei Shao ◽  
Jiahua Hu ◽  
Guiying He ◽  
...  
Keyword(s):  
Solar Cells ◽  
Thermal Annealing ◽  
Organic Solar Cells ◽  
Carrier Transport ◽  
Molecular Conformation ◽  
Transient Absorption ◽  
High Sensitivity ◽  
Perylene Diimide ◽  
Film Morphology ◽  
Femtosecond Transient Absorption

Helical perylene diimide-based (hPDI) acceptors have been established as one of the most promising candidates for non-fullerene organic solar cells (OSCs). In this work, we report a novel hPDI-based molecule, hPDI 2 -CN 2 , as an electron acceptor for OSCs. Combining the hPDI 2 -CN 2 with a low-bandgap polymeric donor (PTB7-Th), the blending film morphology exhibited high sensitivity to various treatments (such as thermal annealing and addition of solvent additives), as evidenced by atomic force microscope studies. The power conversion efficiency (PCE) was improved from 1.42% (as-cast device) to 2.76% after thermal annealing, and a PCE of 3.25% was achieved by further addition of 1,8-diiodooctane (DIO). Femtosecond transient absorption (TA) spectroscopy studies revealed that the improved thin-film morphology was highly beneficial for the charge carrier transport and collection. And a combination of fast exciton diffusion rate and the lowest recombination rate contributed to the best performance of the DIO-treated device. This result further suggests that the molecular conformation needs to be taken into account in the design of perylene diimide-based acceptors for OSCs.

Characterization of ZnO Interlayers for Organic Solar Cells: Correlation of Electrochemical Properties with Thin-Film Morphology and Device Performance

2016 ◽  
Vol 8 (30) ◽  
pp. 19787-19798 ◽  
Author(s):  
Kai-Lin Ou ◽  
Ramanan Ehamparam ◽  
Gordon MacDonald ◽  
Tobias Stubhan ◽  
Xin Wu ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Electrochemical Properties ◽  
Organic Solar Cells ◽  
Device Performance ◽  
Film Morphology

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.

Thin Film Encapsulation of Organic Solar Cells by Direct Deposition of Polysilazanes from Solution

2019 ◽  
pp. 1900598 ◽  
Author(s):  
Iftikhar Ahmed Channa ◽  
Andreas Distler ◽  
Michael Zaiser ◽  
Christoph J. Brabec ◽  
Hans‐Joachim Egelhaaf
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Direct Deposition ◽  
Thin Film Encapsulation

Organic solar cells employing magnetron sputtered p-type nickel oxide thin film as the anode buffer layer

2010 ◽  
Vol 94 (12) ◽  
pp. 2332-2336 ◽  
Author(s):  
Sun-Young Park ◽  
Hye-Ri Kim ◽  
Yong-Jin Kang ◽  
Dong-Ho Kim ◽  
Jae-Wook Kang
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Nickel Oxide ◽  
Buffer Layer ◽  
Organic Solar Cells ◽  
Oxide Thin Film ◽  
Anode Buffer Layer ◽  
P Type ◽  
Type Nickel ◽  
Nickel Oxide Thin Film

Improving the stabilities of organic solar cells via employing a mixed cathode buffer layer

2021 ◽  
Vol 95 (3) ◽  
pp. 30201
Author(s):  
Xi Guan ◽  
Yufei Wang ◽  
Shang Feng ◽  
Jidong Zhang ◽  
Qingqing Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Stability ◽  
Solar Cells ◽  
Mixed Layer ◽  
Organic Solar Cells ◽  
Buffer Layers ◽  
Commercial Development ◽  
Conversion Efficiencies ◽  
Thermal Stability Of ◽  
Cathode Buffer Layers

Organic solar cells (OSCs) have been fabricated using cathode buffer layers based on bathocuproine (BCP) and 4,4'-N,N'-dicarbazole-biphenyl (CBP). It is found that despite nearly same power conversion efficiencies, the bilayer of BCP/CBP shows increased thermal stability of device than the monolayer of BCP, mostly because upper CBP thin film stabilizes under BCP thin film. The mixed layer of BCP:CBP gives slightly decreased efficiency than BCP and BCP/CBP, mostly because the electron mobility of the OSC using BCP:CBP is decreased than those using BCP and BCP/CBP. However, the BCP:CBP increases thermal stability of device than BCP and BCP/CBP, ascribed to that the BCP and CBP effectively inhibit reciprocal tendencies of crystallizations in the mixed layer. Moreover, the BCP:CBP improves the light stability of device than the BCP and BCP/CBP, because the energy transfer from BCP to CBP in in the mixed layer effectively decelerates the photodegradation of BCP. We provide a facial method to improve the stabilities of cathode buffer layers against heat and light, beneficial to the commercial development of OSCs.

Performance enhancement of inverted type organic solar cells by using Eu doped TiO2 thin film

2017 ◽  
Vol 9 ◽  
pp. 64-69 ◽  
Author(s):  
Osman Örnek ◽  
Zühal Alpaslan Kösemen ◽  
Sadullah Öztürk ◽  
Betül Canımkurbey ◽  
Şaban Fındık ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Organic Solar Cells ◽  
Tio2 Thin Film ◽  
Performance Enhancement ◽  
Doped Tio2
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