π-Extended donor-acceptor conjugated copolymers for use as hole transporting materials in perovskite solar cells

Sin, Dong Hun; Hwang, Hyeongjin; Song, Sungwon; Cho, Kilwon

doi:10.1016/j.orgel.2020.105943

Cited by 6 publications

(5 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A very recent example of polymeric HTM based on thieno [3,4-c] pyrrole-4,6(5H)-dione has just been reported. [50] Herein, we report a thermally stable MHT in PSCs. A new D-π-A-π-D small molecule, 1,3-bis(5-(4-(bis(4-methoxyphenyl) amino)phenyl)thieno[3,2-b]thiophen-2-yl)-5-octyl-4H-thieno[3,4c]pyrrole-4,6(5H)-dione, coded HL38, is synthesized based on triphenylamine and thieno[3,4-c]pyrrole-4,6-dione as donor and acceptor units, respectively, in combination with thieno [3,2-b] thiophene as π-linker.…”

Section: % and This Champion Pce Is Even Higher Than That Of The Amentioning

confidence: 90%

Capturing Mobile Lithium Ions in a Molecular Hole Transporter Enhances the Thermal Stability of Perovskite Solar Cells

Kim

Monfreid

et al. 2021

Advanced Materials

View full text Add to dashboard Cite

A thermally stable perovskite solar cell (PSC) based on a new molecular hole transporter (MHT) of 1,3‐bis(5‐(4‐(bis(4‐methoxyphenyl) amino)phenyl)thieno[3,2‐b]thiophen‐2‐yl)‐5‐octyl‐4H‐thieno[3,4‐c]pyrrole‐4,6(5H)‐dione (coded HL38) is reported. Hole mobility of 1.36 × 10−3 cm2 V−1 s−1 and glass transition temperature of 92.2 °C are determined for the HL38 doped with lithium bis(trifluoromethanesulfonyl)imide and 4‐tert‐butylpyridine as additives. Interface engineering with 2‐(2‐aminoethyl)thiophene hydroiodide (2‐TEAI) between the perovskite and the HL38 improves the power conversion efficiency (PCE) from 19.60% (untreated) to 21.98%, and this champion PCE is even higher than that of the additive‐containing 2,2′,7,7′‐tetrakis(N,N‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene (spiro‐MeOTAD)‐based device (21.15%). Thermal stability testing at 85 °C for over 1000 h shows that the HL38‐based PSC retains 85.9% of the initial PCE, while the spiro‐MeOTAD‐based PSC degrades unrecoverably from 21.1% to 5.8%. Time‐of‐flight secondary‐ion mass spectrometry studies combined with Fourier transform infrared spectroscopy reveal that HL38 shows lower lithium ion diffusivity than spiro‐MeOTAD due to a strong complexation of the Li+ with HL38, which is responsible for the higher degree of thermal stability. This work delivers an important message that capturing mobile Li+ in a hole‐transporting layer is critical in designing novel MHTs for improving the thermal stability of PSCs. In addition, it also highlights the impact of interface design on non‐conventional MHTs.

show abstract

Section: % and This Champion Pce Is Even Higher Than That Of The Amentioning

confidence: 90%

Capturing Mobile Lithium Ions in a Molecular Hole Transporter Enhances the Thermal Stability of Perovskite Solar Cells

Kim

Monfreid

et al. 2021

Advanced Materials

View full text Add to dashboard Cite

show abstract

“…The effect is more pronounced in the case of P1 and P2 in accordance with steady-state PL. The exponential fitting of signal decay revealed the shortest charge carrier lifetime (τ 1 = 191.4 ns) for the sample with P3 , indicating a more efficient extraction of holes provided by this material [ 26 , 27 ].…”

Section: Resultsmentioning

confidence: 99%

Novel Push-Pull Benzodithiophene-Containing Polymers as Hole-Transport Materials for Efficient Perovskite Solar Cells

et al. 2022

View full text Add to dashboard Cite

Donor-acceptor conjugated polymers are considered advanced semiconductor materials for the development of thin-film electronics. One of the most attractive families of polymeric semiconductors in terms of photovoltaic applications are benzodithiophene-based polymers owing to their highly tunable electronic and physicochemical properties, and readily scalable production. In this work, we report the synthesis of three novel push–pull benzodithiophene-based polymers with different side chains and their investigation as hole transport materials (HTM) in perovskite solar cells (PSCs). It is shown that polymer P3 that contains triisopropylsilyl side groups exhibits better film-forming ability that, along with high hole mobilities, results in increased characteristics of PSCs. Encouraging a power conversion efficiency (PCE) of 17.4% was achieved for P3-based PSCs that outperformed the efficiency of devices based on P1, P2, and benchmark PTAA polymer. These findings feature the great potential of benzodithiophene-based conjugated polymers as dopant-free HTMs for the fabrication of efficient perovskite solar cells.

show abstract

“…We prepared the BDT-based copolymers by modulating the contents of thienyl and pyridyl units (x = 0, 0.25, 0.50, 0.75 and 1 for Py0, Py1, Py2, Py3, and Py4, respectively) for achieving the finely-tuned electrical and morphological characteristics (Scheme 1). As counter units for BDT-based polymers, thienyl and pyridyl units were employed to obtain the extension of π-conjugation for the generation of intermolecular π-π interaction within polymeric chains 26,[28][29][30][31][32][33] as well as the surface passivative properties for the reduced interfacial traps at perovskite/HTM through the formation of Lewis acid-base coordination. 29,30,34 Particularly, pyridyl unit was used to afford the merits being an electron-deficient core, which could markedly regulate the energetic levels and the hole transport potential of resulting HTMs as a result of their intramolecular push-pull effect.…”

Section: Resultsmentioning

confidence: 99%

Structurally‐tuned benzo[1,2‐b:4,5:b']dithiophene‐based polymer as a dopant‐free hole transport material for perovskite solar cells

Opoku

Lee

Nketia‐Yawson

et al. 2021

Journal of Polymer Science

View full text Add to dashboard Cite

For highly efficient and stable perovskite solar cells (PSCs), hole transport material (HTM) should be designed and synthesized to afford suitable energy levels, high charge transport, efficient passivation ability, and high device stability. Here, we systematically modulated benzo[1,2‐b:4,5:b']dithiophene‐based polymer by finely controlling the thienyl and pyridyl contents within the conjugated backbone in order to develop a high performance dopant‐free HTM for PSCs. We found that the optimized copolymer with 25% of pyridine content exhibits improved energy level, charge transport, and morphology compared with control homopolymers. As a result, remarkably high power conversion efficiencies up to 21.1% were achieved by employing the optimized polymer as a dopant‐free HTM in PSCs.

show abstract

π-Extended donor-acceptor conjugated copolymers for use as hole transporting materials in perovskite solar cells

Cited by 6 publications

References 39 publications

Capturing Mobile Lithium Ions in a Molecular Hole Transporter Enhances the Thermal Stability of Perovskite Solar Cells

Capturing Mobile Lithium Ions in a Molecular Hole Transporter Enhances the Thermal Stability of Perovskite Solar Cells

Novel Push-Pull Benzodithiophene-Containing Polymers as Hole-Transport Materials for Efficient Perovskite Solar Cells

Structurally‐tuned benzo[1,2‐b:4,5:b']dithiophene‐based polymer as a dopant‐free hole transport material for perovskite solar cells

Contact Info

Product

Resources

About