We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Sequentially Fluorinated PTAA Polymers for Enhancing V<sub>OC</sub> of High‐Performance Perovskite Solar Cells.
- Authors
Kim, Youngwoong; Jung, Eui Hyuk; Kim, Geunjin; Kim, Donguk; Kim, Bumjoon J.; Seo, Jangwon
- Abstract
The energy level alignment of the perovskite and hole transporting materials (HTMs) is essential for increasing the open‐circuit voltage (Voc) and enhancing the performance of perovskite solar cells (PSCs). In this work, new sequentially fluorinated poly(triarylamine) polymers (PTAA, 1F‐PTAA, and 2F‐PTAA) with tuned highest occupied molecular orbital (HOMO) energy levels are developed and applied as HTMs into PSCs. The fluorination approach successfully leads to stepwise downshifting of the HOMO levels of PTAA derivatives, resulting in an obvious increase in the Voc and power conversion efficiency (PCE) of the PSCs. In particular, introduction of 1F‐PTAA polymer in (FAPbI3)0.85(MAPbBr3)0.15‐based mesoporous n‐i‐p structure PSCs achieves the high stabilized PCE of 21.2% at the maximum power point with improved Voc of 1.14 V. To elucidate the importance of the optimized degree of fluorination of PTAA polymers on the photovoltaic performances, the optical, electrical, photophysical properties, and doping behaviors of the fluorinated PTAA derivatives are investigated. New polymeric hole transporting materials (HTMs) with downshifted highest occupied molecular orbital (HOMO) energy levels are developed by sequentially introducing electron‐withdrawing fluorine groups into triarylamine‐based polymers. High‐performance perovskite solar cells with these HTMs exhibit outstanding efficiency at maximum power point of 21.2% and high open‐circuit voltage of 1.14 V as a result of a deeper HOMO level and efficient charge extraction.
- Subjects
SOLAR cell efficiency; PEROVSKITE analysis; OPEN-circuit voltage; SOLAR cells; SOLAR energy research
- Publication
Advanced Energy Materials, 2018, Vol 8, Issue 29, pN.PAG
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201801668