Separating crystallization process of P3HT and O-IDTBR to construct highly crystalline interpenetrating network with optimized vertical phase separation

Qiuju Liang, Xuechen Jiao, Ye Yan, Zhiyuan Xie, Guanghao Lu, Jiangang Liu, Yanchun Han

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The morphology with the interpenetrating network and optimized vertical phase separation plays a key role in determining the charge transport and collection in polymer:nonfullerene small molecular acceptors (SMAs) solar cells. However, the crystallization of polymer and SMAs usually occurs simultaneously during film-forming, thus interfering with the crystallization process of each other, leading to amorphous film with undesirable lateral and vertical phase separation. The poly(3-hexylthiophene) (P3HT):O-IDTBR blend is selected as a model system, and controlling film-forming kinetics to solve these problems is proposed. Herein, a cosolvent 1,2,4-triclorobenzene (TCB) with selective solubility and a high boiling point is added to the solution, leading to prior crystallization of P3HT and extended film-forming duration. As a result, the crystallinity of both components is enhanced significantly. Meanwhile, the prior crystallization of P3HT induces solid–liquid phase separation, hence rationalizing the formation of the nano-interpenetrating network. Moreover, the surface energy drives O-IDTBR to enrich near the cathode and P3HT to migrate to the anode. Consequently, a highly crystalline nano-interpenetrating network with proper vertical phase separation is obtained. The optimal morphology improves charge transport and suppresses bimolecular recombination, boosting the power conversion efficiency from 4.45% to 7.18%, which is the highest performance in P3HT-based binary nonfullerene solar cells.

Original languageEnglish
Article number1807591
Number of pages12
JournalAdvanced Functional Materials
DOIs
Publication statusAccepted/In press - 20 Jan 2019
Externally publishedYes

Keywords

  • crystallinity
  • film-forming kinetics
  • morphology
  • nonfullerene solar cells
  • vertical phase separation

Cite this

@article{06dde0e6b7f94b478ae6f304c7f58834,
title = "Separating crystallization process of P3HT and O-IDTBR to construct highly crystalline interpenetrating network with optimized vertical phase separation",
abstract = "The morphology with the interpenetrating network and optimized vertical phase separation plays a key role in determining the charge transport and collection in polymer:nonfullerene small molecular acceptors (SMAs) solar cells. However, the crystallization of polymer and SMAs usually occurs simultaneously during film-forming, thus interfering with the crystallization process of each other, leading to amorphous film with undesirable lateral and vertical phase separation. The poly(3-hexylthiophene) (P3HT):O-IDTBR blend is selected as a model system, and controlling film-forming kinetics to solve these problems is proposed. Herein, a cosolvent 1,2,4-triclorobenzene (TCB) with selective solubility and a high boiling point is added to the solution, leading to prior crystallization of P3HT and extended film-forming duration. As a result, the crystallinity of both components is enhanced significantly. Meanwhile, the prior crystallization of P3HT induces solid–liquid phase separation, hence rationalizing the formation of the nano-interpenetrating network. Moreover, the surface energy drives O-IDTBR to enrich near the cathode and P3HT to migrate to the anode. Consequently, a highly crystalline nano-interpenetrating network with proper vertical phase separation is obtained. The optimal morphology improves charge transport and suppresses bimolecular recombination, boosting the power conversion efficiency from 4.45{\%} to 7.18{\%}, which is the highest performance in P3HT-based binary nonfullerene solar cells.",
keywords = "crystallinity, film-forming kinetics, morphology, nonfullerene solar cells, vertical phase separation",
author = "Qiuju Liang and Xuechen Jiao and Ye Yan and Zhiyuan Xie and Guanghao Lu and Jiangang Liu and Yanchun Han",
year = "2019",
month = "1",
day = "20",
doi = "10.1002/adfm.201807591",
language = "English",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "Wiley-VCH Verlag GmbH & Co. KGaA",

}

Separating crystallization process of P3HT and O-IDTBR to construct highly crystalline interpenetrating network with optimized vertical phase separation. / Liang, Qiuju; Jiao, Xuechen; Yan, Ye; Xie, Zhiyuan; Lu, Guanghao; Liu, Jiangang; Han, Yanchun.

In: Advanced Functional Materials, 20.01.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Separating crystallization process of P3HT and O-IDTBR to construct highly crystalline interpenetrating network with optimized vertical phase separation

AU - Liang, Qiuju

AU - Jiao, Xuechen

AU - Yan, Ye

AU - Xie, Zhiyuan

AU - Lu, Guanghao

AU - Liu, Jiangang

AU - Han, Yanchun

PY - 2019/1/20

Y1 - 2019/1/20

N2 - The morphology with the interpenetrating network and optimized vertical phase separation plays a key role in determining the charge transport and collection in polymer:nonfullerene small molecular acceptors (SMAs) solar cells. However, the crystallization of polymer and SMAs usually occurs simultaneously during film-forming, thus interfering with the crystallization process of each other, leading to amorphous film with undesirable lateral and vertical phase separation. The poly(3-hexylthiophene) (P3HT):O-IDTBR blend is selected as a model system, and controlling film-forming kinetics to solve these problems is proposed. Herein, a cosolvent 1,2,4-triclorobenzene (TCB) with selective solubility and a high boiling point is added to the solution, leading to prior crystallization of P3HT and extended film-forming duration. As a result, the crystallinity of both components is enhanced significantly. Meanwhile, the prior crystallization of P3HT induces solid–liquid phase separation, hence rationalizing the formation of the nano-interpenetrating network. Moreover, the surface energy drives O-IDTBR to enrich near the cathode and P3HT to migrate to the anode. Consequently, a highly crystalline nano-interpenetrating network with proper vertical phase separation is obtained. The optimal morphology improves charge transport and suppresses bimolecular recombination, boosting the power conversion efficiency from 4.45% to 7.18%, which is the highest performance in P3HT-based binary nonfullerene solar cells.

AB - The morphology with the interpenetrating network and optimized vertical phase separation plays a key role in determining the charge transport and collection in polymer:nonfullerene small molecular acceptors (SMAs) solar cells. However, the crystallization of polymer and SMAs usually occurs simultaneously during film-forming, thus interfering with the crystallization process of each other, leading to amorphous film with undesirable lateral and vertical phase separation. The poly(3-hexylthiophene) (P3HT):O-IDTBR blend is selected as a model system, and controlling film-forming kinetics to solve these problems is proposed. Herein, a cosolvent 1,2,4-triclorobenzene (TCB) with selective solubility and a high boiling point is added to the solution, leading to prior crystallization of P3HT and extended film-forming duration. As a result, the crystallinity of both components is enhanced significantly. Meanwhile, the prior crystallization of P3HT induces solid–liquid phase separation, hence rationalizing the formation of the nano-interpenetrating network. Moreover, the surface energy drives O-IDTBR to enrich near the cathode and P3HT to migrate to the anode. Consequently, a highly crystalline nano-interpenetrating network with proper vertical phase separation is obtained. The optimal morphology improves charge transport and suppresses bimolecular recombination, boosting the power conversion efficiency from 4.45% to 7.18%, which is the highest performance in P3HT-based binary nonfullerene solar cells.

KW - crystallinity

KW - film-forming kinetics

KW - morphology

KW - nonfullerene solar cells

KW - vertical phase separation

UR - http://www.scopus.com/inward/record.url?scp=85060348342&partnerID=8YFLogxK

U2 - 10.1002/adfm.201807591

DO - 10.1002/adfm.201807591

M3 - Article

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

M1 - 1807591

ER -