scholarly journals Quantifying Quasi‐Fermi Level Splitting and Open‐Circuit Voltage Losses in Highly Efficient Nonfullerene Organic Solar Cells

Solar RRL ◽  
2020 ◽  
pp. 2000649
Author(s):  
Le Quang Phuong ◽  
Seyed Mehrdad Hosseini ◽  
Oskar J. Sandberg ◽  
Yingping Zou ◽  
Han Young Woo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fermi Level ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Highly Efficient ◽  
Quasi Fermi Level ◽  
Level Splitting

scholarly journals On the Relation between the Open‐Circuit Voltage and Quasi‐Fermi Level Splitting in Efficient Perovskite Solar Cells

2019 ◽  
Vol 9 (33) ◽  
pp. 1901631 ◽  
Author(s):  
Pietro Caprioglio ◽  
Martin Stolterfoht ◽  
Christian M. Wolff ◽  
Thomas Unold ◽  
Bernd Rech ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fermi Level ◽  
Open Circuit Voltage ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Quasi Fermi Level ◽  
Level Splitting

scholarly journals Improving organic photovoltaic cells by forcing electrode work function well beyond onset of Ohmic transition

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chao Zhao ◽  
Cindy G. Tang ◽  
Zong-Long Seah ◽  
Qi-Mian Koh ◽  
Lay-Lay Chua ◽  
...  
Keyword(s):  
Solar Cells ◽  
Fermi Level ◽  
Work Function ◽  
Organic Solar Cells ◽  
Carrier Mobility ◽  
Fill Factor ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Fermi Level Pinning ◽  
Electrode Contact

AbstractAs electrode work function rises or falls sufficiently, the organic semiconductor/electrode contact reaches Fermi-level pinning, and then, few tenths of an electron-volt later, Ohmic transition. For organic solar cells, the resultant flattening of open-circuit voltage (Voc) and fill factor (FF) leads to a ‘plateau’ that maximizes power conversion efficiency (PCE). Here, we demonstrate this plateau in fact tilts slightly upwards. Thus, further driving of the electrode work function can continue to improve Voc and FF, albeit slowly. The first effect arises from the coercion of Fermi level up the semiconductor density-of-states in the case of ‘soft’ Fermi pinning, raising cell built-in potential. The second effect arises from the contact-induced enhancement of majority-carrier mobility. We exemplify these using PBDTTPD:PCBM solar cells, where PBDTTPD is a prototypal face-stacked semiconductor, and where work function of the hole collection layer is systematically ‘tuned’ from onset of Fermi-level pinning, through Ohmic transition, and well into the Ohmic regime.

Solution-processed small molecules with ethynylene bridges for highly efficient organic solar cells

2016 ◽  
Vol 4 (38) ◽  
pp. 14720-14728 ◽  
Author(s):  
Yuanyuan Kan ◽  
Chang Liu ◽  
Lianjie Zhang ◽  
Ke Gao ◽  
Feng Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecules ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Conjugated Molecules ◽  
Solution Processed ◽  
Highly Efficient

Inserting ethynylene bridges in conjugated molecules can enhance high open-circuit voltage and fill factors to improve photovoltaic performances in organic solar cells.

scholarly journals Correction: Non-halogenated-solvent-processed highly efficient organic solar cells with a record open circuit voltage enabled by noncovalently locked novel polymer donors

2020 ◽  
Vol 8 (5) ◽  
pp. 2851-2851
Author(s):  
Hui Guo ◽  
Youdi Zhang ◽  
Lie Chen ◽  
Xunfan Liao ◽  
Qian Xie ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Highly Efficient

Correction for ‘Non-halogenated-solvent-processed highly efficient organic solar cells with a record open circuit voltage enabled by noncovalently locked novel polymer donors’ by Hui Guo et al., J. Mater. Chem. A, 2019, 7, 27394–27402.

Non-halogenated-solvent-processed highly efficient organic solar cells with a record open circuit voltage enabled by noncovalently locked novel polymer donors

2019 ◽  
Vol 7 (48) ◽  
pp. 27394-27402 ◽  
Author(s):  
Hui Guo ◽  
Youdi Zhang ◽  
Lie Chen ◽  
Xunfan Liao ◽  
Qian Xie ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Loss ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Highly Efficient ◽  
Homo Level

The difluorine and carboxylate substitutions can effectively down-shift the HOMO level of the donors, improved molecular face-on orientation and reduced energy loss.

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