Origin of temperature-dependent performance of hole-transport-layer-free perovskite solar cells doped with CuSCN

Donghee Kang, Dongguen Shin, Kyu Joon Lee, Soohyung Park, Jae Pyoung Ahn, Junkyeong Jeong, Jisu Yoo, Kiwoong Kim, Hyunbok Lee, Yeonjin Yi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Recently, a hole-transport-layer (HTL)-free structure was proposed to decrease the cost of organic lead halide perovskite solar cell (PSC) fabrication. In HTL-free PSCs, instead of using an HTL insertion, the HTL material can be added directly into a perovskite precursor solution to improve hole transport. For example, copper thiocyanate (CuSCN) is used for p-type doping of methylammonium lead triiodide (MAPI) via spin coating from a mixed solution. However, the optimum annealing temperature for CuSCN-doped MAPI (CuSCN:MAPI) PSCs is lower than the 100 °C that is typical for undoped MAPI PSCs. In this study, the origin of such lower annealing temperatures of CuSCN:MAPI PSCs is investigated. The highest power conversion efficiency (PCE) and enhanced electron transport in CuSCN:MAPI are obtained with annealing at 60 °C. Using transmission electron microscopy-energy-dispersive X-ray spectroscopy, it is revealed that annealing at 60 °C results in the uniform distribution of CuSCN, while the annealing at 100 °C induces the aggregation of CuSCN with a diameter of ~20 nm. A large energy barrier formed by the shallow-lying conduction band minimum of these CuSCN clusters hinders electron transport. The lower PCE of CuSCN:MAPI PSCs with annealing at 100 °C is attributed to this deterioration in the electron transport.

Original languageEnglish
Article number105958
JournalOrganic Electronics
Publication statusPublished - 2020 Dec

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea [ NRF-2020R1A2C2014644 , 2017R1A5A1014862 (SRC program: vdWMRC center), 2018R1D1A1B07051050 , and 2018R1A6A1A03025582 ]; Samsung Display Company; and Industry-Academy joint research program between Samsung Electronics and Yonsei University.

Publisher Copyright:
© 2020 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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