Solid-state dye-sensitized solar cells based on spiro-MeOTAD

Howie, Wendy H.; Harris, J. E.; Jennings, James R.; Peter, Laurence M.

doi:10.1016/j.solmat.2006.10.003

Cited by 35 publications

(24 citation statements)

References 7 publications

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“…These advantageous effects are generally induced by adding additives to the Spiro film, i.e. lithium salts, tBP and/or iridium or cobalt based catalysts [15][16][17][18].…”

Section: Absorption Studies Of a Ps Device And Ps Filmmentioning

confidence: 99%

Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cells

Sánchez

Mas‐Marzá

2016

Solar Energy Materials and Solar Cells

139

130

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Perovskite (PS) solar cells have emerged as a promising technology for low-cost and efficient photovoltaics. However, the main limiting factors relay on their low long-term stability. The loss of performance of these devices is commonly attributed to degradation of the PS itself. In order to further explore the origins of such limited stability, we have developed UV-VIS spectroscopy studies that clearly demonstrate that PS layers remain unalterable under the working conditions. On the contrary, significant variations in the absorption spectra of the Spiro-OMeTAD layer (Spiro), a commonly used hole transporting material (HTM), indicate that the loss of performance over the irradiation time could be attributed to the degradation of Spiro. UV-VIS measurements evidence a photo-induced oxidation of Spiro, both under air and inert atmosphere. This photo-oxidation is accelerated by the commonly employed additives of the Spiro (LiTFSI and tBP), as well as by the interfacial contact with the electron injecting layer (TiO 2 ). Therefore, our results point to the Spiro degradation as the main mechanism that induces the limited functioning of the PS solar cells. Consequently, focusing on the development of alternative HTMs stable under the working conditions is one of the critical issues to be overcome for a suitable progress of PS solar cells and related optoelectronic devices.

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“…These advantageous effects are generally induced by adding additives to the Spiro film, i.e. lithium salts, tBP and/or iridium or cobalt based catalysts [15][16][17][18].…”

Section: Absorption Studies Of a Ps Device And Ps Filmmentioning

confidence: 99%

Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cells

Sánchez

Mas‐Marzá

2016

Solar Energy Materials and Solar Cells

139

130

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“…D r a f t 14 As shown in Figure 4b), HTM04 displays the highest J sc among the new HTMs and is known to have excellent hole mobility.…”

Section: Hole-transporting Layer (Htl) Surface Morphologymentioning

confidence: 97%

“…9 Furthermore, spiro-OMeTAD requires the use of p-type dopants (e.g., tert-butylpyridine (tBP) and lithium trifluoromethanesulfonate (Li-TFSI)) to increase conductivity and hole-mobility to yield high-performance devices. [12][13][14] However, such dopants are hygroscopic and detrimental to the long-term stability of the cell and thus not practical as agents in commercial solar cells. 15 It is therefore important to develop efficient, yet dopant-free, 16 economical HTMs.…”

Section: Introductionmentioning

confidence: 99%

Development of simple hole-transporting materials for perovskite solar cells

et al. 2016

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Three low-cost propeller-shaped small molecules based on a triphenylamine core and the high-performance donor molecule 7,7′-[4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene-2,6-diyl]bis[6-fluoro-4-(5′-hexyl-[2,2′-bithiophen]-5-yl)benzo[c][1,2,5]thiadiazole] (DTS(FBTTh2)2) were investigated as hole-transporting materials in perovskite solar cells. Each hole-transporting material was designed with highly modular side arms, allowing for different bandgaps and thin-film properties while maintaining a consistent binding energy of the highest occupied molecular orbitals to facilitate hole extraction from the perovskite active layer. Perovskite solar cell devices were fabricated with each of the three triphenylamine-based hole-transporting materials and DTS(FBTTh2)2 and were compared to devices with 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) hole-transporting layers. Each of our triphenylamine hole-transporting materials and DTS(FBTTh2)2 displayed surface morphologies that were considerably rougher than that of spiro-OMeTAD; a factor that may contribute to lower device performance. It was found that using inert, insulating polymers as additives with DTS(FBTTh2)2 reduced the surface roughness, resulting in devices with higher photocurrents.

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“…PSCs are considered to have emerged from the field of dye‐sensitized solar cells (DSSCs) . With the successful application of spiro‐OMeTAD in DSSCs, it seems reasonable to utilize this material in PSCs.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Photovoltaic Performance of Perovskite–Spirobifluorene Solar Cells

Song

Liu²,

Wang

et al. 2017

ChemPhysChem

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Lead halide perovskite solar cells with remarkable power conversion efficiency have attracted much attention in recent years. However, there still exist many problems with their use that are not completely understood, and further studies are needed. Herein, the hole-transport layer dependence of the photovoltaic performance of perovskite solar cells is investigated in detail. It is found that devices freshly prepared using pristine 2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) and Li-doped spiro-OMeTAD as hole-transport layers exhibit S-shaped current density-voltage curves with poor fill factors. The devices show progressively improved fill factors and efficiencies upon exposure to air, which is attributed to air-induced conductivity improvement in the spiro-OMeTAD layer. After introducing a cobalt salt dopant (FK209) into the spiro-OMeTAD layer, the corresponding devices show remarkable performance without the need of air exposure. These results confirm that the dopant not only increases the conductivity of spiro-OMeTAD layer, but also tunes the surface potential, which helps to improve charge transport and reduce the recombination loss.

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Solid-state dye-sensitized solar cells based on spiro-MeOTAD

Cited by 35 publications

References 7 publications

Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cells

Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cells

Development of simple hole-transporting materials for perovskite solar cells

Understanding the Photovoltaic Performance of Perovskite–Spirobifluorene Solar Cells

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