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Small. 2016 Sep;12(35):4902-4908. doi: 10.1002/smll.201601603. Epub 2016 Jul 22.

Highly Efficient p-i-n Perovskite Solar Cells Utilizing Novel Low-Temperature Solution-Processed Hole Transport Materials with Linear π-Conjugated Structure.

Li Y1,2, Xu Z3,4, Zhao S1,2, Qiao B1,2, Huang D1,2, Zhao L1,2, Zhao J1,2, Wang P1,2, Zhu Y1,2, Li X5,6, Liu X7,8, Xu X1,2.

Author information

1
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing, 100044, China.
2
Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing, 100044, China.
3
Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education, Beijing, 100044, China. zhengxu@bjtu.edu.cn.
4
Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing, 100044, China. zhengxu@bjtu.edu.cn.
5
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China. lixianggao@tju.edu.cn.
6
School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China. lixianggao@tju.edu.cn.
7
Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China.
8
School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

Abstract

Alternative low-temperature solution-processed hole-transporting materials (HTMs) without dopant are critical for highly efficient perovskite solar cells (PSCs). Here, two novel small molecule HTMs with linear π-conjugated structure, 4,4'-bis(4-(di-p-toyl)aminostyryl)biphenyl (TPASBP) and 1,4'-bis(4-(di-p-toyl)aminostyryl)benzene (TPASB), are applied as hole-transporting layer (HTL) by low-temperature (sub-100 °C) solution-processed method in p-i-n PSCs. Compared with standard poly(3,4-ethylenedioxythiophene): poly(styrenesulfonic acid) (PEDOT:PSS) HTL, both TPASBP and TPASB HTLs can promote the growth of perovskite (CH3 NH3 PbI3 ) film consisting of large grains and less grain boundaries. Furthermore, the hole extraction at HTL/CH3 NH3 PbI3 interface and the hole transport in HTL are also more efficient under the conditions of using TPASBP or TPASB as HTL. Hence, the photovoltaic performance of the PSCs is dramatically enhanced, leading to the high efficiencies of 17.4% and 17.6% for the PSCs using TPASBP and TPASB as HTL, respectively, which are ≈40% higher than that of the standard PSC using PEDOT:PSS HTL.

KEYWORDS:

hole-transporting layer; p-i-n architecture; perovskite solar cells; small molecular

PMID:
27443160
DOI:
10.1002/smll.201601603

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