TY - JOUR
T1 - Wide-bandgap donor polymers from organic photovoltaics as dopant-free hole transport layers for perovskite solar cells
AU - Lai, Hongtao
AU - Yang, Xin
AU - Zhang, Liujiang
AU - Bi, Leyu
AU - Tian, Binqiang
AU - Wang, Huanhuan
AU - Gao, Xingyu
AU - Lu, Lingfeng
AU - Kan, Bin
AU - Ji, Xiaofei
AU - Fu, Qiang
PY - 2024/6/1
Y1 - 2024/6/1
N2 - Dopant-free polymer hole transport materials (HTMs) exhibit high thermal stability, hydrophobicity and film-processing capabilities, demonstrating excellent device efficiency and stability in perovskite solar cells (PSCs). Continued innovation of wide-bandgap polymers in organic photovoltaics (OPV) provides a valuable toolbox for developing polymeric HTMs. Here, we propose an effective molecule design for selecting structurally relevant polymers (D18, D18-Cl, PBQx-TCl) available for commercialization. We discover that the highly planar conjugated backbones play a crucial role in regulating the packing orientation of the film relative to the perovskite. The moderate aggregation with face-on packing orientation is conducive to the high-quality film, which is responsible for better contact with perovskite and superior charge extraction and transport. Simultaneously, these polymers with robust passivation enhanced the open circuit voltage (VOC) without additional passivation layers, streamlining the device process. Consequently, a PSC using dopant-free PBQx-TCl HTL demonstrated an efficiency of 24.12 % with a high VOC of 1.20 V and good operational stability (T90 > 600 h). This work reveals transparent structure–function-performance relationships between molecules and devices, paving the way for the subsequent development of high-performance HTMs. © 2024 Elsevier B.V.
AB - Dopant-free polymer hole transport materials (HTMs) exhibit high thermal stability, hydrophobicity and film-processing capabilities, demonstrating excellent device efficiency and stability in perovskite solar cells (PSCs). Continued innovation of wide-bandgap polymers in organic photovoltaics (OPV) provides a valuable toolbox for developing polymeric HTMs. Here, we propose an effective molecule design for selecting structurally relevant polymers (D18, D18-Cl, PBQx-TCl) available for commercialization. We discover that the highly planar conjugated backbones play a crucial role in regulating the packing orientation of the film relative to the perovskite. The moderate aggregation with face-on packing orientation is conducive to the high-quality film, which is responsible for better contact with perovskite and superior charge extraction and transport. Simultaneously, these polymers with robust passivation enhanced the open circuit voltage (VOC) without additional passivation layers, streamlining the device process. Consequently, a PSC using dopant-free PBQx-TCl HTL demonstrated an efficiency of 24.12 % with a high VOC of 1.20 V and good operational stability (T90 > 600 h). This work reveals transparent structure–function-performance relationships between molecules and devices, paving the way for the subsequent development of high-performance HTMs. © 2024 Elsevier B.V.
KW - Defect passivation
KW - Dopant-free polymer
KW - Hole transport
KW - Organic photovoltaics
KW - Perovskite solar cells
UR - http://www.scopus.com/inward/record.url?scp=85190561681&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85190561681&origin=recordpage
U2 - 10.1016/j.cej.2024.151383
DO - 10.1016/j.cej.2024.151383
M3 - RGC 21 - Publication in refereed journal
SN - 1385-8947
VL - 489
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 151383
ER -