Charge generation dynamics in polymer/polymer solar cells studied by transient absorption spectroscopy

2011 ◽  
Vol 1 (1) ◽  
pp. 011118 ◽  
Author(s):  
Hideo Ohkita
Keyword(s):  
Solar Cells ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Polymer Solar Cells ◽  
Transient Absorption Spectroscopy ◽  
Charge Generation

scholarly journals Aggregation Controlled Charge Generation in Fullerene Based Bulk Heterojunction Polymer Solar Cells: Effect of Additive

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 115
Author(s):  
Washat Ware ◽  
Tia Wright ◽  
Yimin Mao ◽  
Shubo Han ◽  
Jessa Guffie ◽  
...  
Keyword(s):  
Solar Cells ◽  
Polymer Blends ◽  
Transient Absorption ◽  
Polymer Solar Cells ◽  
Acid Methyl Ester ◽  
Transient Absorption Spectroscopy ◽  
Generation Process ◽  
Charge Generation ◽  
Highly Efficient ◽  
The Impact

Optimization of charge generation in polymer blends is crucial for the fabrication of highly efficient polymer solar cells. While the impacts of the polymer chemical structure, energy alignment, and interface on charge generation have been well studied, not much is known about the impact of polymer aggregation on charge generation. Here, we studied the impact of aggregation on charge generation using transient absorption spectroscopy, neutron scattering, and atomic force microscopy. Our measurements indicate that the 1,8-diiodooctane additive can change the aggregation behavior of poly(benzodithiophene-alt-dithienyl difluorobenzotriazole (PBnDT-FTAZ) and phenyl-C61-butyric acid methyl ester (PCBM)polymer blends and impact the charge generation process. Our observations show that the charge generation can be optimized by tuning the aggregation in polymer blends, which can be beneficial for the design of highly efficient fullerene-based organic photovoltaic devices.

scholarly journals Transient Absorption Spectroscopy for Polymer Solar Cells

2016 ◽  
Vol 22 (1) ◽  
pp. 100-111 ◽  
Author(s):  
Hideo Ohkita ◽  
Yasunari Tamai ◽  
Hiroaki Benten ◽  
Shinzaburo Ito
Keyword(s):  
Solar Cells ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Polymer Solar Cells ◽  
Transient Absorption Spectroscopy

scholarly journals Ultrafast Charge Generation Enhancement in Nanoscale Polymer Solar Cells with DIO Additive

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2174
Author(s):  
Tongchao Shi ◽  
Zeyu Zhang ◽  
Xia Guo ◽  
Zhengzheng Liu ◽  
Chunwei Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Vibrational Relaxation ◽  
Transient Absorption ◽  
Polymer Solar Cells ◽  
Acid Methyl Ester ◽  
Free Charge ◽  
Exciton Dissociation ◽  
Charge Generation ◽  
Carrier Generation ◽  
Acid Methyl

We study the ultrafast photoexcitation dynamics in PBDTTT-C-T (P51, poly(4,8-bis(5-(2-ethylhexyl)-thiophene-2-yl)-benzo[1,2-b:4,5-b′]dithiophene-alt-alkylcarbonyl-thieno[3,4-b]thiophene)) film (~100 nm thickness) and PBDTTT-C-T:PC71BM (P51:PC71BM, phenyl-C71-butyric-acid-methyl ester) nanostructured blend (∼100 nm thickness) with/without DIO(1,8-diiodooctane) additives with sub-10 fs transient absorption (TA). It is revealed that hot-exciton dissociation and vibrational relaxation could occur in P51 with a lifetime of ~160 fs and was hardly affected by DIO. However, the introduction of DIO in P51 brings a longer lifetime of polaron pairs, which could make a contribution to photocarrier generation. In P51:PC71BM nanostructured blends, DIO could promote the Charge Transfer (CT) excitons and free charges generation with a ~5% increasement in ~100 fs. Moreover, the dissociation of CT excitons is faster with DIO, showing a ~5% growth within 1 ps. The promotion of CT excitons and free charge generation by DIO additive is closely related with active layer nanomorphology, accounting for Jsc enhancement. These results reveal the effect of DIO on carrier generation and separation, providing an effective route to improve the efficiency of nanoscale polymer solar cells.

scholarly journals Identification of different pathways of electron injection in dye-sensitised solar cells of electrodeposited ZnO using an indoline sensitiser

2016 ◽  
Vol 18 (13) ◽  
pp. 8938-8944 ◽  
Author(s):  
Iulia Minda ◽  
Essraa Ahmed ◽  
Vivien Sleziona ◽  
Christoph Richter ◽  
Max Beu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Electron Injection ◽  
Transient Absorption Spectroscopy ◽  
Ultrafast Transient Absorption ◽  
Charge Transfer Dynamics ◽  
Ultrafast Transient Absorption Spectroscopy

Charge transfer dynamics in fully operational dye sensitised solar cells as observed using ultrafast transient absorption spectroscopy.

Direct monitoring of ultrafast electron and hole dynamics in perovskite solar cells

2015 ◽  
Vol 17 (22) ◽  
pp. 14674-14684 ◽  
Author(s):  
Piotr Piatkowski ◽  
Boiko Cohen ◽  
Francisco Javier Ramos ◽  
Maria Di Nunzio ◽  
Mohammad Khaja Nazeeruddin ◽  
...  
Keyword(s):  
Solar Cells ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Perovskite Solar Cells ◽  
Transient Absorption Spectroscopy ◽  
Trap States ◽  
Surface Trap

Electron and hole dynamics, and internal and surface trap states in perovskite-based solar cells are explored by fs transient absorption spectroscopy.

scholarly journals Insights from Transient Absorption Spectroscopy into Electron Dynamics Along the Ga‐Gradient in Cu(In,Ga)Se 2 Solar Cells

2021 ◽  
Vol 11 (8) ◽  
pp. 2003446
Author(s):  
Yu‐Han Chang ◽  
Romain Carron ◽  
Mario Ochoa ◽  
Carlota Bozal‐Ginesta ◽  
Ayodhya N. Tiwari ◽  
...  
Keyword(s):  
Solar Cells ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Electron Dynamics
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