Elimination of charge trapping at defects is highly challenging for poly-crystalline organometal halide perovskites. Here, we report a new architecture for reinforcing the built-in electric field (Ein) across the photoactive layer with a pair of strong electric dipole layers (EDLs). The paired EDLs significantly intensify the Ein across the perovskite layer, resulting in suppressed charge trapping of photogenerated charges. As a result, our low-temperature processed P-I-N planar PeSC devices using the paired EDLs exhibit a higher power conversion efficiency (ηmax ∼ 19.4%) and a smaller device-to-device variation with a standard deviation (S.D.) of 0.70%, which far surpass those (ηmax ∼ 17.8%, S.D. ∼ 1.1%) of the devices with typical charge transport layers.
Bibliographical noteFunding Information:
J.-H. L. and J. K. contributed equally to this work. We thank the Heeger Center for Advanced Materials (HCAM) at the Gwangju Institute of Science and Technology (GIST) for their assistance with the measurements. This work was supported by the GIST Research Institute (GRI) Project through a grant provided by GIST in 2018; by the National Research Foundation of Korea (NRF) through a grant funded by the Ministry of Science, ICT & Future Planning (MSIP) (NRF-2015M1A2A2057510); by the Global Research Laboratory Program of NRF funded by MSIP (NRF-2017K1A1A2013153); by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and by the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 0173010013000).
© 2018 The Royal Society of Chemistry.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering