Energy level-modulated non-fullerene small molecule acceptors for improved VOC and efficiency of inverted perovskite solar cells

2019 ◽  
Vol 7 (7) ◽  
pp. 3336-3343 ◽  
Author(s):  
Xiaohui Liu ◽  
Xiaodong Li ◽  
Yang Zou ◽  
He Liu ◽  
Lei Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Small Molecule ◽  
Energy Levels ◽  
Perovskite Solar Cells

The efficiency and VOC of inverted perovskite solar cells are regularly improved by non-fullerene small molecule acceptors with modulated energy levels.

Tris(4-(1-phenyl-1H-benzo[d]imidazole)phenyl)phosphine oxide for enhanced mobility and restricted traps in photovoltaic interlayers

2021 ◽  
Vol 9 (10) ◽  
pp. 3642-3651
Author(s):  
Jihyun Lim ◽  
Do-Yeong Choi ◽  
Woongsik Jang ◽  
Hyeon-Ho Choi ◽  
Yun-Hi Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Small Molecule ◽  
Phosphine Oxide ◽  
Organic Material ◽  
Perovskite Solar Cells ◽  
Effective Electron ◽  
Enhanced Mobility

Small molecule organic material, tris(4-(1-phenyl-1H-benzo[d]imidazole)phenyl)phosphine oxide (TIPO) was newly synthesised and introduced into an n-type interlayer in planar perovskite solar cells for effective electron transport.

Star-shaped cyclopentadithiophene-based dopant-free hole-transporting material for high-performance perovskite solar cells

2021 ◽  
Author(s):  
Kun-Mu Lee ◽  
Jui-Yu Yang ◽  
Ping-Sheng Lai ◽  
Ke-Jyun Luo ◽  
Ting Yu Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Free Hole ◽  
Hole Transporting ◽  
Hole Transporting Material

A new cyclopentadithiophene (CPDT)-based organic small molecule serves as an efficient dopant-free hole transporting material (HTM) for perovskite solar cells (PSCs). Upon incorporation of two carbazole groups, the resulting CPDT-based...

Effect of core engineering on triphenylamine derivative-based dopant-free hole-transporting materials for perovskite solar cells: from theoretical calculation to experimental research

2021 ◽  
Author(s):  
Qian Chen ◽  
Puhang Chen ◽  
Hongyuan Liu ◽  
Xiaorui Liu
Keyword(s):  
Solar Cells ◽  
Theoretical Calculation ◽  
Small Molecule ◽  
Experimental Research ◽  
Perovskite Solar Cells ◽  
Free Hole ◽  
High Efficient ◽  
Hole Transporting ◽  
Hole Transporting Materials ◽  
Triphenylamine Derivative

Computational actuation on design of small-molecule triphenylamine derivative-based hole-transporting materials (HTMs) is a high-efficient way to acquire potential HTMs for perovskite solar cells (PSCs). In the work, on basis of...

scholarly journals The Effects of Molecular Packing Behavior of Small-Molecule Acceptors in Ternary Organic Solar Cells

2021 ◽  
Vol 11 (2) ◽  
pp. 755
Author(s):  
Eunhee Lim
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Ternary System ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Orbital Energy ◽  
Working Mechanism ◽  
Energy Level Structure ◽  
The Third ◽  
Molecular Backbone

Herein, two diketopyrrolopyrrole (DPP)-based, small-molecule isomers, o- and p-DPP-PhCN, were introduced as acceptors in ternary organic solar cells (OSCs). The isomers have the same molecular backbone but differ in the positions of the cyanide (CN) substituents (ortho and para), which greatly affects their packing behavior. Ternary solar cells composed of poly(3-hexylthiophene) (P3HT):DPP-PhCN:phenyl-C61-butyric acid methyl ester (PCBM) were fabricated, and the effects of the different packing behaviors of the third component on the device performance and the working mechanism of the ternary cells were investigated. The addition of o-DPP-PhCN with a relatively high-lying lowest unoccupied molecular orbital energy level resulted in an increase in the open-circuit voltage (VOC) in the ternary devices, demonstrating the alloy-like structure of the two acceptors (o-DPP-PhCN and PCBM) in the ternary system. However, the p-DPP-PhCN-based ternary cells exhibited VOC values similar to that of a P3HT:PCBM binary cell, irrespective of the addition of p-DPP-PhCN, indicating a cascade energy-level structure in the ternary system and an effective charge transfer from the P3HT to the PCBM. Importantly, by increasing the addition of p-DPP-PhCN, the short-circuit current density increased substantially, resulting in pronounced shoulder peaks in the external quantum efficiency responses in the long-wavelength region, corresponding to the contribution of the photocurrent generated by the light absorption of p-DPP-PhCN. Despite sharing the same molecular backbone, the two DPP-PhCNs exhibited substantially different packing behaviors according to the position of their CN substituents, which also greatly affected the working mechanism of the ternary devices fabricated using the DPP-PhCNs as the third component.

scholarly journals Surface Passivation of Perovskite Film by Small Molecule Infiltration for Improved Efficiency of Perovskite Solar Cells

2016 ◽  
Vol 8 (5) ◽  
pp. 1-7 ◽  
Author(s):  
Ming Xu ◽  
Jing Feng ◽  
Xia-Li Ou ◽  
Zhen-Yu Zhang ◽  
Yi-Fan Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Surface Passivation ◽  
Perovskite Solar Cells
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