Constructing Multiscale Fibrous Morphology to Achieve 20% Efficiency Organic Solar Cells by Mixing High and Low Molecular Weight D18

被引：90

作者：

Wei, Nan ^{[1
,2
]}

Chen, Jieni ^{[3
,4
]}

Cheng, Yetai ^{[2
]}

Bian, Ziqing ^{[1
]}

Liu, Wenlong ^{[1
]}

Song, Haoming ^{[1
]}

Guo, Yawen ^{[1
]}

Zhang, Wenkai ^{[3
,4
]}

Liu, Yahui ^{[2
]}

Lu, Hao ^{[2
]}

Zhou, Jianjun ^{[1
]}

Bo, Zhishan ^{[1
]}

机构：

[1] Beijing Normal Univ, Coll Chem, Beijing Key Lab Energy Convers & Storage Mat, Beijing 100875, Peoples R China

[2] Qingdao Univ, Coll Text & Clothing, Coll Mat Sci & Engn, State Key Lab Biofibers & Ecotext, Qingdao 266071, Peoples R China

[3] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

[4] Beijing Normal Univ, Appl Opt Beijing Area Major Lab, Beijing 100875, Peoples R China

来源：

ADVANCED MATERIALS | 2024年 / 36卷 / 41期

基金：

中国国家自然科学基金;

关键词：

energy loss; high efficiency; multilength-scale morphology; nonfullerene acceptors; organic solar cells; EXCITON DIFFUSION; FULLERENE;

D O I：

10.1002/adma.202408934

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This study underscores the significance of precisely manipulating the morphology of the active layer in organic solar cells (OSCs). By blending polymer donors of D18 with varying molecular weights, a multiscale interpenetrating fiber network structure within the active layer is successfully created. The introduction of 10% low molecular weight D18 (LW-D18) into high molecular weight D18 (HW-D18) produces MIX-D18, which exhibits an extended exciton diffusion distance and orderly molecular stacking. Devices utilizing MIX-D18 demonstrate superior electron and hole transport, improves exciton dissociation, enhances charge collection efficiency, and reduces trap-assisted recombination compared to the other two materials. Through the use of the nonfullerene acceptor L8-BO, a remarkable power conversion efficiency (PCE) of 20.0% is achieved. This methodology, which integrates the favorable attributes of high and low molecular weight polymers, opens a new avenue for enhancing the performance of OSCs. MIX-D18, by mixing HW-D18 (high molecular weight D18) and LW-D18 (low molecular weight D18), can form multiscale fibrous morphology. The finer nanofibers of HW-D18 can increase Donor/Acceptor contact, enhancing exciton dissociation and collection efficiency, while the thicker nanofibers of LW-D18 can improve crystallinity and boost charge transport capability. Ultimately, a efficiency of 20.0% is achieved by MIX-D18:L8-BO device. image

引用

页数：10

共 51 条

[1]

Armitstead K., 1992, MACROMOLECULES SYNTH, P288

[2] Intrinsic non-radiative voltage losses in fullerene-based organic solar cells [J].