Role of electrode buffer layers in organic solar cells

Solvent additive (SA) treatment is the most effective strategy to obtain highly efficient non-fullerene organic solar cells (NF-OSCs). However, NF-OSCs with SA treatment usually exhibits different or even opposite effect...

Download Full-text

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

The European Physical Journal Applied Physics ◽

10.1051/epjap/2021210151 ◽

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.

Download Full-text

Emphasizing the Operational Role of a Novel Graphene-Based Ink into High Performance Ternary Organic Solar Cells

10.20944/preprints201911.0352.v1 ◽

2019 ◽

Author(s):

Minas M. Stylianakis ◽

Dimitriοs M. Kosmidis ◽

Katerina Anagnostou ◽

Christos Polyzoidis ◽

Miron Krassas ◽

...

Keyword(s):

Solar Cells ◽

Molecular Orbital ◽

Organic Solar Cells ◽

High Performance ◽

Energy Levels ◽

Fullerene Derivative ◽

Highest Occupied Molecular Orbital ◽

Lowest Unoccupied Molecular Orbital ◽

Synthetic Routes

A novel solution-processed graphene-based material was synthesized by treating graphene oxide (GO) with 2,5,7-trinitro-9-oxo-fluorenone-4-carboxylic acid (TNF-COOH) moieties, via simple synthetic routes. The yielded molecule N-[(carbamoyl-GO)ethyl]-N’-[(carbamoyl)-(2,5,7-trinitro-9-oxo-fluorene)] (GO-TNF) was thoroughly characterized and it was shown that it presents favorable highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels to function as a bridge component between the polymeric donor poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophenediyl}) (PTB7) and the fullerene derivative acceptor [6,6]-phenyl-C71-butyric-acid-methylester (PC71BM). In this context, a GO-TNF based ink was prepared and directly incorporated within the binary photoactive layer, in different volume ratios (1-3% ratio to the blend), for the effective realization of inverted ternary organic solar cells (OSCs) of the structure ITO/PFN/PTB7:GO-TNF:PC71BM/MoO3/Al. The addition of 2% v/v GO-TNF ink led to a champion power conversion efficiency (PCE) of 8.71% that was enhanced by ~13% as compared to the reference cell.

Download Full-text

Role of geminate polaron-pair recombination on magnetoconductance in P3HT and PC71BM bulk-heterojunction organic solar cells

Organic Electronics ◽

10.1016/j.orgel.2018.08.005 ◽

2018 ◽

Vol 63 ◽

pp. 384-391 ◽

Cited By ~ 2

Author(s):

Se Jin Lee ◽

Sang Bong Lee ◽

Sung Cheol Yoon ◽

Eun Young Choi ◽

Choon Sup Yoon

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Bulk Heterojunction

Download Full-text

Improved mechanical adhesion and electronic stability of organic solar cells with thermal ageing: the role of diffusion at the hole extraction interface

Journal of Materials Chemistry A ◽

10.1039/c6ta09665d ◽

2017 ◽

Vol 5 (6) ◽

pp. 2911-2919 ◽

Cited By ~ 15

Author(s):

W. Greenbank ◽

N. Rolston ◽

E. Destouesse ◽

G. Wantz ◽

L. Hirsch ◽

...

Keyword(s):

Renewable Energy ◽

Solar Cells ◽

Organic Solar Cells ◽

Thermal Ageing ◽

Organic Photovoltaic ◽

Mechanical Adhesion ◽

Photovoltaic Solar Cells

Organic photovoltaic solar cells are a promising option for cheap, renewable energy, but must improve in their stability.

Download Full-text

Ternary Organic Solar Cells: A Review of The Role of the Third Element☆

Nano Energy ◽

10.1016/j.nanoen.2021.106915 ◽

2022 ◽

pp. 106915

Author(s):

Nutifafa Y. Doumon ◽

Lili Yang ◽

Federico Rosei

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

The Third

Download Full-text

The role of dipole moment in two fused-ring electron acceptor and one polymer donor based ternary organic solar cells

Materials Chemistry Frontiers ◽

10.1039/d0qm00016g ◽

2020 ◽

Vol 4 (5) ◽

pp. 1507-1518 ◽

Cited By ~ 3

Author(s):

Xunfan Liao ◽

Yongjie Cui ◽

Xueliang Shi ◽

Zhaoyang Yao ◽

Heng Zhao ◽

...

Keyword(s):

Solar Cells ◽

Dipole Moment ◽

Electron Acceptor ◽

Organic Solar Cells ◽

Working Mechanism ◽

Fused Ring

The dipole moment of FREAs’ terminals has been unveiled as an important factor and its working mechanism has been thoroughly investigated. Our results demonstrate that the dipole moment should also be taken into account in designing ternary OSCs.

Download Full-text