Interrelation between Crystal Packing and Small‐Molecule Organic Solar Cell Performance

Fitzner, Roland; Elschner, Chris; Weil, Mat­thias; Uhrich, Christian; Körner, Christian; Riede, Moritz; Leo, Karl; Pfeiffer, Martin; Reinold, Egon; Mena‐Osteritz, Elena; Bäuerle, Peter

doi:10.1002/adma.201104439

Cited by 131 publications

(130 citation statements)

References 17 publications

(18 reference statements)

Supporting

Mentioning

123

Contrasting

Unclassified

Order By: Relevance

“…[84,85] It is generally acknowledged that further methodological improvements are necessary and we simply resort here to one of the best and straightforward options currently available. A quantitative study of the exciton diffusion along the columns of the DCVSN5 system can be performed by monitoring 2 22 ( ) ( [37][38][39][40]86] when they are used in SM-OSCs. In many molecular materials, the exciton transport takes place via hopping and the slow exciton diffusion to the donoracceptor interface in SM-OSC is one of the main efficiency loss mechanisms.…”

Section: Exciton Transport In the Coherent Regime: The Case Of Dcvsn5mentioning

confidence: 99%

Regimes of Exciton Transport in Molecular Crystals in the Presence of Dynamic Disorder

Aragó

Troisi

2015

Adv Funct Materials

133

View full text Add to dashboard Cite

Thermal motions in molecular crystals cause substantial fluctuation of the excitonic coupling between neighboring molecules (dynamic disorder). We explore the effect of such fluctuation on the exciton dynamics in two limiting cases, exemplified by the crystals of anthracene and a heteropentacene derivative. When the excitonic coupling is small in comparison with the electron phonon coupling, the exciton diffusion is incoherent and the inclusion of excitonic coupling fluctuation does not alter the exciton physics but can improve the agreement between computed and experimental diffusion coefficients. For large excitonic couplings, when the transport becomes coherent, the thermal motions determine the diffusivity of the exciton, which can be several orders of magnitude larger than in the incoherent case. The coherent regime is less frequent but potentially of great technological importance.2

show abstract

Section: Exciton Transport In the Coherent Regime: The Case Of Dcvsn5mentioning

confidence: 99%

Regimes of Exciton Transport in Molecular Crystals in the Presence of Dynamic Disorder

Aragó

Troisi

2015

Adv Funct Materials

133

View full text Add to dashboard Cite

show abstract

“…8a was obtained as a green-red solid (0.06mmol, 115mg, 95.5 % yield), mp: >300°C. 1 H-NMR (400 MHz, CDCl 3 ) δ/ppm: 9.09 (d,4H,J = 3.9 Hz),30.87,30.80,30.75,30.58,26.42,26.29,26.22,26.09,26.02,25.99,25.89,25.80,25.69,25.60,25.49,25.38,24.33,24.21,24.11,15.22,15.20,15.16,15.14,15.04,13. 2930,2860,1700,1570,1490,1460,1400,1320,1240,1190,1140,1070,957,850,789,708.…”

Section: Synthesis Of 1amentioning

confidence: 99%

“…We want to remark that different alkyl chains provoke remarkable differences in solid state properties that are crucial for exciton diffusion and charge transport and consequently for the photovoltaic performance. 13 These two porphyrin molecules were used as donor along with PC 71 BM as acceptor component for the fabrication of solution processed bulk heterojunction organic solar cells and showed over all PCE of 2.75 % and 3.18 % for 1a:PC 71 BM and 1b:PC 71 BM, respectively processed with THF solution. When the active layer of device was processed with pyridine/THF solution, the photovoltaic characteristics were significantly improved resulting in PCE of 5.27 % and 5.78 %, for 1a:PC 71 BM and 1b:PC 71 BM, respectively.…”

mentioning

confidence: 99%

CuSCN as selective contact in solution-processed small-molecule organic solar cells leads to over 7% efficient porphyrin-based device

et al. 2016

View full text Add to dashboard Cite

show abstract

“…[ 33,34 ] For thin fi lms of organic photovoltaic, lots of efforts have been made to improve the fi lm crystallinity to broaden absorption spectra and increase mobility. [35][36][37][38] Thus, a cocrystal with thickness of 50 nm to 1 µm contains hundreds or even thousands of ideally bicontinuous and highly ordered molecular-scale p-n junctions, which is believed to facilitate the exciton dissociation and charge transport. Third, OPV devices based on single cocrystal may help us understand the fundamental physical processes in photovoltaic and photocurrent generation that is not fully clear yet.…”

mentioning

confidence: 99%

Organic Cocrystal Photovoltaic Behavior: A Model System to Study Charge Recombination of C₆₀ and C₇₀ at the Molecular Level

Zhang

Jiang

Zhen

et al. 2016

Adv Elect Materials

View full text Add to dashboard Cite

regions shows an improved PCE, indicating that cocrystallinity could play an important role in photovoltaic properties. [21][22][23] Here, we demonstrate this concept by studying the photovoltaic behavior of individual organic segregated-packing cocrystal (Figure 1 d).D-A system is important for the nucleation and growth of cocrystals, [24][25][26][27][28][29][30] forming mixed-and segregated-packing motifs, and the latter provides not only a molecular-scale phase layer for excitons diffusion but also a bicontinuous layer-by-layer donoracceptor composite with large interlayer area for exciton dissociation. And hence such packing motif is optimum for photovoltaic study. For example, sulfur-bridged annulene DPTTA and C 60 system form nice donor-acceptor segregated-packing cocrystals, [ 25 ] and here we use devices of individual cocrystal of DPTTA-C 60 to study the photovoltaic behavior of such D-A segregated-packing structure. It should be the fi rst cocrystal prototype photovoltaic device with ideal segregated arrangement in the active layer.Figure 2 a shows chemical structure of DPTTA, C 60 , and C 70 . C 60 /C 70 -DPTTA cocrystals were prepared by a facile drop-casting method. Blend solution of DPTTA and C 60 /C 70 dissolved in chlorobenzene was poured over clean Si/SiO 2 (300 nm) substrate at room temperature in a glovebox. After solvent evaporation, nanosheet cocrystals were obtained. Before fabrication of devices, residual solvent was removed by annealing at 80 °C for 1 h under vacuum condition. Figure 2 b,c represents the single crystal morphology of DPTTA, C 60 , C 60 -DPTTA, and C 70 -DPTTA. According to X-ray crystallography and X-ray diffraction, donor and acceptor molecules alternatively stack layer by layer on Si/SiO 2 substrate for both C 60 -DPTTA and C 70 -DPTTA nanosheets. [ 25 ] Figure 2 d indicates that DPTTA and C 60 /C 70 have several absorption peaks at the visible range. Relatively, the absorbance ability is much stronger for DPTTA with respect to the fullerenes. Hence, most of excitons are generated in the donor layers. UV-vis absorptions for C 60 , C 70 , DPTTA, DPTTA/C 60 , and DPTTA/C 70 fi lm were also performed, as shown in Figure S2 (Supporting Information).

show abstract

Interrelation between Crystal Packing and Small‐Molecule Organic Solar Cell Performance

Cited by 131 publications

References 17 publications

Regimes of Exciton Transport in Molecular Crystals in the Presence of Dynamic Disorder

Regimes of Exciton Transport in Molecular Crystals in the Presence of Dynamic Disorder

CuSCN as selective contact in solution-processed small-molecule organic solar cells leads to over 7% efficient porphyrin-based device

Organic Cocrystal Photovoltaic Behavior: A Model System to Study Charge Recombination of C₆₀ and C₇₀ at the Molecular Level

Contact Info

Product

Resources

About

Interrelation between Crystal Packing and Small‐Molecule Organic Solar Cell Performance

Cited by 131 publications

References 17 publications

Regimes of Exciton Transport in Molecular Crystals in the Presence of Dynamic Disorder

Regimes of Exciton Transport in Molecular Crystals in the Presence of Dynamic Disorder

CuSCN as selective contact in solution-processed small-molecule organic solar cells leads to over 7% efficient porphyrin-based device

Organic Cocrystal Photovoltaic Behavior: A Model System to Study Charge Recombination of C60 and C70 at the Molecular Level

Contact Info

Product

Resources

About

Organic Cocrystal Photovoltaic Behavior: A Model System to Study Charge Recombination of C₆₀ and C₇₀ at the Molecular Level