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

Yang Li; Zheng Xu; Suling Zhao; Bo Qiao; Di Huang; Ling Zhao; Jiao Zhao; Peng Wang; Youqin Zhu; Xianggao Li; Xicheng Liu; Xurong Xu

doi:10.1002/smll.201601603

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

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

Authors

Yang Li^{1

2}, Zheng Xu^{3

4}, Suling Zhao^{1

2}, Bo Qiao^{1

2}, Di Huang^{1

2}, Ling Zhao^{1

2}, Jiao Zhao^{1

2}, Peng Wang^{1

2}, Youqin Zhu^{1

2}, Xianggao Li^{5

6}, Xicheng Liu^{7

8}, Xurong Xu^{1

2}

Affiliations

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.

PMID: 27443160
DOI: 10.1002/smll.201601603

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.