Role of Localized States on Carrier Transport in Bulk Heterojunction Materials Comprised of Organic Small Molecule Donors

2013 ◽  
Vol 26 (15) ◽  
pp. 2341-2345 ◽  
Author(s):  
Chengmei Zhong ◽  
Fei Huang ◽  
Yong Cao ◽  
Daniel Moses ◽  
Alan J. Heeger
Keyword(s):  
Small Molecule ◽  
Carrier Transport ◽  
Bulk Heterojunction ◽  
Localized States

Manifestation of Carrier Relaxation Through the Manifold of Localized States in PCDTBT:PC60BM Bulk Heterojunction Material: The Role of PC84BM Traps on the Carrier Transport

2012 ◽  
Vol 24 (17) ◽  
pp. 2273-2277 ◽  
Author(s):  
Wei Lin Leong ◽  
Gerardo Hernandez-Sosa ◽  
Sarah R. Cowan ◽  
Daniel Moses ◽  
Alan J. Heeger
Keyword(s):  
Carrier Transport ◽  
Bulk Heterojunction ◽  
Localized States ◽  
Carrier Relaxation

Role of trace impurities in the photovoltaic performance of solution processed small-molecule bulk heterojunction solar cells

2012 ◽  
Vol 3 (6) ◽  
pp. 2103 ◽  
Author(s):  
Wei Lin Leong ◽  
Gregory C. Welch ◽  
Loren G. Kaake ◽  
Christopher J. Takacs ◽  
Yanming Sun ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Trace Impurities ◽  
Solution Processed ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells

Soluble porphyrin donors for small molecule bulk heterojunction solar cells

2012 ◽  
Vol 22 (36) ◽  
pp. 19258 ◽  
Author(s):  
Junichi Hatano ◽  
Naoki Obata ◽  
Shigeru Yamaguchi ◽  
Takeshi Yasuda ◽  
Yutaka Matsuo
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Bulk Heterojunction ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells

scholarly journals The role of spin in the degradation of organic photovoltaics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ivan Ramirez ◽  
Alberto Privitera ◽  
Safakath Karuthedath ◽  
Anna Jungbluth ◽  
Johannes Benduhn ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Bulk Heterojunction ◽  
Critical Factor ◽  
Model Systems ◽  
Transient Absorption Spectroscopy ◽  
Triplet States ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
A Charge

AbstractStability is now a critical factor in the commercialization of organic photovoltaic (OPV) devices. Both extrinsic stability to oxygen and water and intrinsic stability to light and heat in inert conditions must be achieved. Triplet states are known to be problematic in both cases, leading to singlet oxygen production or fullerene dimerization. The latter is thought to proceed from unquenched singlet excitons that have undergone intersystem crossing (ISC). Instead, we show that in bulk heterojunction (BHJ) solar cells the photo-degradation of C60 via photo-oligomerization occurs primarily via back-hole transfer (BHT) from a charge-transfer state to a C60 excited triplet state. We demonstrate this to be the principal pathway from a combination of steady-state optoelectronic measurements, time-resolved electron paramagnetic resonance, and temperature-dependent transient absorption spectroscopy on model systems. BHT is a much more serious concern than ISC because it cannot be mitigated by improved exciton quenching, obtained for example by a finer BHJ morphology. As BHT is not specific to fullerenes, our results suggest that the role of electron and hole back transfer in the degradation of BHJs should also be carefully considered when designing stable OPV devices.

scholarly journals Impact of Tortuosity on Charge-Carrier Transport in Organic Bulk Heterojunction Blends

2017 ◽  
Vol 8 (5) ◽  
Author(s):  
Michael C. Heiber ◽  
Klaus Kister ◽  
Andreas Baumann ◽  
Vladimir Dyakonov ◽  
Carsten Deibel ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Carrier Transport ◽  
Bulk Heterojunction ◽  
Charge Carrier Transport
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