Enhanced thermal stability of organic solar cells by using photolinkable end-capped polythiophenes

Khiev, Sokha; Derue, Lionel; Ayenew, Getachew; Medlej, H.; Brown, Ross; Rubatat, Laurent; Hiorns, Roger C.; Wantz, Guillaume; Dagron‐Lartigau, Christine

doi:10.1039/c3py00423f

Cited by 18 publications

(12 citation statements)

References 19 publications

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“…27,29 The inhibition of nano-crystal formation with WBC coating and light processing correlates qualitatively with our device thermal stability results, whereby SC device performance in dark conditions is the least stable under thermal stress. Intriguingly, we find that morphological studies of thermally induced PC 60 BM crystallization of the same blends when cast onto SiOx substrates, as used in several previous studies, 20,21,32,[47][48][49][50][51] does not correlate with our device stability data.…”

Section: Morphological Stabilitycontrasting

confidence: 63%

“…As cast films on SiOx are uniform in all cases ( Figure S6) in agreement with previous findings, 21 and annealing at 80°C does not suffice to induce crystallization, as seen by AFM and optical microscopy. Thermal annealing of thin blend films supported by SiOx substrates above glass transition temperature at 140°C results exclusively in micron-sized fullerene crystals, 20,21,32,[47][48][49][50][51] in contrast to nano-sized on PEDOT:PSS substrates. 21 The number density of micron-scale crystals in WBC films is now considerably higher (Figure 4c) than in SC films (Figure 4a) for 'dark' control blends.…”

Section: Morphological Stabilitymentioning

confidence: 99%

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Synergetic enhancement of organic solar cell thermal stability by wire bar coating and light processing

Tan

Wong

et al. 2015

J. Mater. Chem. C

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† Electronic Supplementary Information (ESI) available: SC and WBC drying kinetics measurements. UV-vis absorption spectra of SC and WBC PCDTBT:PC60BM blend layers. PL spectra of SC and WBC blended layers and their respective PCDTBT neat layers. EQE of blend devices deposited by SC and WBC techniques. Optical microscopy images of the blend layer deposited by SC and WBC on SiOx (as cast) and PEDOT:PSS (at 80°C and 140°C thermal annealing temperature). SeeWe demonstrate that organic solar cells can exhibit different morphological and performance stability under thermal stress depending upon the processing technique employed, without compromising initial device efficiency. In particular, we investigate benchmark PCDTBT:PC60BM solar cells fabricated by wire bar coating (a technique attractive for commercial manufacture) and the more widely employed, lab scale, technique of spin coating. For this system, wire bar deposition results in superior device stability, with lifetime improvements in excess of 20-fold compared to spun cast devices. Neutron reflectivity reveals that the enhanced PC60BM segregation to the top interface in the slower, wire bar, casting process is likely responsible for the hindered PC60BM nucleation at tens of nm length scale, characterized by atomic force microscopy (AFM), and thus enhanced morphological stability. Modest light exposure of the active layer (at approximately 10 mWcm -2 ), known to reversibly photo-oligomerize fullerenes and thus impart morphological stability, is found to further improve device stability by a factor of 10. The combined effects of wire bar coating and light processing are highly synergetic, resulting in solar cells which are overall 200 times more stable than devices prepared by spin casting without light processing.

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Section: Morphological Stabilitycontrasting

confidence: 63%

Section: Morphological Stabilitymentioning

confidence: 99%

Synergetic enhancement of organic solar cell thermal stability by wire bar coating and light processing

Tan

Wong

et al. 2015

J. Mater. Chem. C

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“…8). For example the vinyl functionality has also been used to end-cap di-n-hexylfluorene and P3HT polymers, incorporated as either a styrene [85] or anthracene moiety [86]. The vinyl moieties are expected to react with fullerenes, which by optical microscopy inhibit aggregation, with initial PCE being largely independent of the UV exposure time.…”

Section: Alternative Strategies To Lock Polymer Morphologymentioning

confidence: 98%

Organic photovoltaics: Crosslinking for optimal morphology and stability

2015

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“…These PCBM clusters interrupt charge carrier separation and transport, severely reducing PCE as a result . To prevent formation of PCBM clusters, the strategies for thermally stable morphology have been developed …”

Section: Introductionmentioning

confidence: 99%

Thermally Stable Dibenzo[def,mno]chrysene‐Based Polymer Solar Cells: Effect of Thermal Annealing on the Morphology and Photovoltaic Performances

Hong

Kim

et al. 2016

Macro Chemistry & Physics

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The photovoltaic performances of dibenzo[def,mno]chrysene‐based polymer (poly(2,2′‐thiophenevinylenthiophene‐4,10‐[6,12‐bis(2‐decyltetradecyloxy)‐dibenzo[def,mno]chrysene]) (PTVTC) or poly(4,10‐bithiophene‐6,12‐bis(2‐decyltetradecyloxy)‐dibenzo[def,mno]chrysene) (PTTC)) solar cells as a function of thermal annealing temperatures from 100 to 180 °C are reported. Interestingly, the solar cells with PTTC containing two thiophene units, have superior thermal stability compared to the PTVTC:[6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM) solar cells, in which the PTVTC has two thiophene and vinyl groups. Atomic force microscopy, transmission electron microscopy, and X‐ray diffraction demonstrate that morphological stability of PTTC:PC71BM blend films conduces thermally stable photovoltaic performances of PTTC solar cells. Therefore, the PTTC:PC71BM bulk heterojunction solar cells have highly stable efficiency, retaining 97% of its original power conversion efficiency value without PCBM clusters in the blend films even at elevated temperatures. There have been no previous reports on the thermal stability aspect of dibenzo[def,mno]chrysene‐based polymer solar cells so far.

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Enhanced thermal stability of organic solar cells by using photolinkable end-capped polythiophenes

Cited by 18 publications

References 19 publications

Synergetic enhancement of organic solar cell thermal stability by wire bar coating and light processing

Synergetic enhancement of organic solar cell thermal stability by wire bar coating and light processing

Organic photovoltaics: Crosslinking for optimal morphology and stability

Thermally Stable Dibenzo[def,mno]chrysene‐Based Polymer Solar Cells: Effect of Thermal Annealing on the Morphology and Photovoltaic Performances

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