Small molecule donors with different conjugated π linking bridges: Synthesis and photovoltaic properties

Xiyue Dong; Dingqin Hu; Pengyu Chen; Xuexin Dai; Chao Hu; Zeyun Xiao; Shirong Lu

doi:10.1088/1674-4926/41/12/122201

Journals >Journal of Semiconductors >Volume 41 >Issue 12 >Page 122201 > Article

Journal of Semiconductors
Vol. 41, Issue 12, 122201 (2020)

Small molecule donors with different conjugated π linking bridges: Synthesis and photovoltaic properties

Xiyue Dong^1、2, Dingqin Hu¹, Pengyu Chen³, Xuexin Dai⁴, Chao Hu¹, Zeyun Xiao¹, and Shirong Lu¹

Author Affiliations

¹Organic Semiconductor Research Center, Chongqing Institute of Green and Intelligent Technology, Chongqing School, University of Chinese Academy of Sciences (UCAS Chongqing), Chinese Academy of Sciences, Chongqing 400714, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³University of Manchester, Manchester M13 9PL, UK

⁴School of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, China

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DOI: 10.1088/1674-4926/41/12/122201 Cite this Article

Xiyue Dong, Dingqin Hu, Pengyu Chen, Xuexin Dai, Chao Hu, Zeyun Xiao, Shirong Lu. Small molecule donors with different conjugated π linking bridges: Synthesis and photovoltaic properties[J]. Journal of Semiconductors, 2020, 41(12): 122201 Copy Citation Text

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Fig. 1. (Color online) Synthetic routes of B-T-CN, B-TT-CN, and B-DTT-CN.

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(Color online) Molecular structures of B-T-CN, B-TT-CN, B-DTT-CN, and PC71BM.

Fig. 1. (Color online) Molecular structures of B-T-CN, B-TT-CN, B-DTT-CN, and PC₇₁BM.

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Fig. 2. (Color online) (a) Film absorption of donor and acceptor materials. (b) The energy levels diagram of B-T-CN, B-TT-CN, B-DTT-CN, and PC₇₁BM.

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Fig. 3. (Color online) (a) The device structure of the all small molecule OSCs. (b) Representative current density versus applied voltage curves. (c) EQE spectra of the optimized devices.

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Fig. 4. (Color online) (a) J_sc versus light intensity. (b) V_oc versus light intensity relationships.

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Fig. 5. (Color online) Hole/electron mobility of optimized (a) B-T-CN:PC₇₁BM film, (b) B-TT-CN:PC₇₁BM film, and (c) B-DTT-CN:PC₇₁BM film.

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Fig. 6. (Color online) Surface morphology of blend films. AFM height images of (a) B-T-CN:PC₇₁BM blend film, (b) B-TT-CN:PC₇₁BM blend film, and (c) B-DTT-CN:PC₇₁BM blend film.

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$(Color online) GIWAXS two-dimensional diffraction patterns of (a) B-T-CN:PC71BM blend film, (b) B-TT-CN:PC71BM blend film, and (c) B-DTT-CN:PC71BM blend film. (d)The azimuthal angle distribution of π–π stacking.$

Fig. 7. (Color online) GIWAXS two-dimensional diffraction patterns of (a) B-T-CN:PC₇₁BM blend film, (b) B-TT-CN:PC₇₁BM blend film, and (c) B-DTT-CN:PC₇₁BM blend film. (d)The azimuthal angle distribution of π–π stacking.

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Donor	λ_peak (nm)	λ_onset (nm)	E_g^opt (eV)	E_HOMO (eV)	E_LUMO (eV)	E_g^cv (eV)	T_d (°C)
B-T-CN	561, 609	666	1.86	–5.27	–2.86	2.41	341
B-TT-CN	549, 596	645	1.92	–5.31	–2.88	2.43	353
B-DTT-CN	541, 588	637	1.95	–5.40	–2.85	2.55	316

Table 1. Optical and electrochemical properties of B-T-CN, B-TT-CN, and B-DTT-CN.

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Active layer	V_oc (V)	J_sc (mA/cm²)	FF (%)	PCE (%)
B-T-CN:PC₇₁BM	0.90	5.29	55.7	2.65
B-TT-CN:PC₇₁BM	0.94	4.20	54.8	2.16
B-DTT-CN:PC₇₁BM	0.96	2.61	39.8	1.00

Table 2. Photovoltaic performances of B-T-CN:PC₇₁BM-, B-TT-CN:PC₇₁BM-, and B-DTT-CN:PC₇₁BM-based OSC devices.

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