TY - JOUR
T1 - A Highly Crystalline Fused-Ring n-Type Small Molecule for Non-Fullerene Acceptor Based Organic Solar Cells and Field-Effect Transistors
AU - Song, Xin
AU - Gasparini, Nicola
AU - Nahid, Masrur Morshed
AU - Chen, Hu
AU - Macphee, Sky Marie
AU - Zhang, Weimin
AU - Norman, Victoria
AU - Zhu, Chenhui
AU - Bryant, Daniel
AU - Ade, Harald
AU - McCulloch, Iain
AU - Baran, Derya
N1 - Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/8/29
Y1 - 2018/8/29
N2 - N-type organic small molecules (SMs) are attracting attention in the organic electronics field, due to their easy purification procedures with high yield. However, only a few reports show SMs that perform well in both organic field-effect transistors (OFETs) and organic solar cells (OSCs). Here, the synthesis and characterization of an n-type small molecule with an indacenodithieno[3,2-b]thiophene (IDTT) core unit and linear alkylated side chain (C16) (IDTTIC) are reported. Compared to the state-of-the-art n-type molecule IDTIC, IDTTIC exhibits smaller optical bandgap and higher absorption coefficient, which is due to the enhanced intramolecular effect. After mixing with the polymer donor PBDB-T, IDTIC-based solar cells deliver a power conversion efficiency of only 5.67%. In stark contrast, the OSC performance of IDTTIC improves significantly to 11.2%. It is found that the superior photovoltaic properties of PBDB-T:IDTTIC blends are mainly due to reduced trap-assisted recombination and enhanced molecular packing coherence length and higher domain purity when compared to IDTIC. Moreover, a significantly higher electron mobility of 0.50 cm2 V−1 s−1 for IDTTIC in OFET devices than for IDTIC (0.15 cm2 V−1 s−1) is obtained. These superior performances in OSCs and OFETs demonstrate that SMs with extended π-conjugation of the backbone possess a great potential for application in organic electronic devices.
AB - N-type organic small molecules (SMs) are attracting attention in the organic electronics field, due to their easy purification procedures with high yield. However, only a few reports show SMs that perform well in both organic field-effect transistors (OFETs) and organic solar cells (OSCs). Here, the synthesis and characterization of an n-type small molecule with an indacenodithieno[3,2-b]thiophene (IDTT) core unit and linear alkylated side chain (C16) (IDTTIC) are reported. Compared to the state-of-the-art n-type molecule IDTIC, IDTTIC exhibits smaller optical bandgap and higher absorption coefficient, which is due to the enhanced intramolecular effect. After mixing with the polymer donor PBDB-T, IDTIC-based solar cells deliver a power conversion efficiency of only 5.67%. In stark contrast, the OSC performance of IDTTIC improves significantly to 11.2%. It is found that the superior photovoltaic properties of PBDB-T:IDTTIC blends are mainly due to reduced trap-assisted recombination and enhanced molecular packing coherence length and higher domain purity when compared to IDTIC. Moreover, a significantly higher electron mobility of 0.50 cm2 V−1 s−1 for IDTTIC in OFET devices than for IDTIC (0.15 cm2 V−1 s−1) is obtained. These superior performances in OSCs and OFETs demonstrate that SMs with extended π-conjugation of the backbone possess a great potential for application in organic electronic devices.
KW - fused-ring small molecules
KW - high photo-to-current efficiency
KW - non-fullerene acceptors
KW - organic field-effect transistors
KW - organic solar cells
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U2 - 10.1002/adfm.201802895
DO - 10.1002/adfm.201802895
M3 - Article
AN - SCOPUS:85050371947
SN - 1616-301X
VL - 28
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 35
M1 - 1802895
ER -