Department of Chemical and Biomolecular Engineering
Korea Advanced Institute of Science and Technology

Recent Achievements


[cover picture] Self-Organization of Polymer Additive, Poly(2-vinylpyridine) via One-Step Solution Processing to Enhance the Efficiency and Stability of Polymer Solar Cells

Title: Self-Organization of Polymer Additive, Poly(2-vinylpyridine) via One-Step Solution Processing to Enhance the Efficiency and Stability of Polymer Solar Cells

Author: Wonho Lee, Seonju Jeong, Changyeon Lee, Gibok Han, Changsoon Cho, Jung-Yong Lee, Bumjoon J. Kim* 


Journal: Advanced Energy Materials, 2017, Vol.7, 1602812


 Interfaces between the photoactive layers and electrodes play critical roles in controlling the performance of optoelectronic devices. Herein, a novel nonconjugated polymer additive (nPA), poly(2-vinylpyridine) (P2VP), is reported for modifying the interfaces between the bulk-heterojunction (BHJ) and cathode/metal oxide (MO) layers. The P2VP nPA enables remarkably enhanced power conversion efficiencies (PCEs) and ambient stability in different types of polymer solar cells (PSCs). Importantly, interfacial engineering can be achieved during deposition of the P2VP nPA-containing BHJ active layer via simple, one-step solution processing. The P2VP nPA has much higher surface energy than the BHJ active components and stronger interaction with the surface of MO, which affords spontaneous vertical phase separation from the BHJ layer on the MO surface by one-step solution processing. The self-assembled P2VP layer substantially reduces the work function and surface defect density of MO, thereby minimizing the charge-extraction barrier and increasing the PCEs of the PSCs significantly, i.e., PTB7-Th:PC71BM (10.53%11.14%), PTB7:PC71BM (7.37%8.67%), and PTB7-Th:P(NDI2HD-T) all-PSCs (5.52%6.14%). In addition, the lifetimes of the PSCs are greatly improved by the use of the P2VP nPA. 







첨부파일 다운로드




  • 페이스북 공유
  • 트위터 공유
  • Google+ 공유
  • 인쇄하기
스팸방지코드 :
Simple and Universal Platform for Logic Gate Operations Based on Molecular Beacon Probes (Small 14/2012 Ki Soo Park, Myung Wan Seo, Cheulhee Jung, Joon Young Lee, Hyun Gyu Park Article first published online: 13 JUL 2012 DOI: 10.1002/smll.201290077 The cover picture illustrates how the hairpin-structured molecular beacon probe interacts with DNA input and generates a high ...
  Nanoscale, 2012, 4, 3879–3885 DOI: 10.1039/C2NR30168G First published on the web 03 Apr 2012   Gle Park,a Leian Bartolome,b Kyoung G. Lee,a Seok Jae Lee,a Do Hyun Kim*b and Tae Jung Park*a    a: Center for Nanobio Integration & Convergence Engineering (NICE), National Nanofab Center    b: Department of Chemical & Biomolecula...
  Advanced Energy MaterialsVolume 2, Issue 6, pages 645–650, June, 2012  Myung-Hyun Ryou, Dong Jin Lee,Je-Nam Lee, Yong Min Lee, Jung-Ki Park, Jang Wook Choi, Article first published online: 13 APR 2012 DOI: 10.1002/aenm.201100687 An excellent cycle life (150 cycles with 80% retention) for lithium-metal anodes in lithium-ion batteries is achieved by empl...
A microfluidic droplet generator uniformly encapsulates an equivalent number ofengineered E. coli cells and the same Fe and Mn metal ion concentrations inidentically sized droplets. In their Communication (DOI: 10.1002/anie.201208977),T. S. Seo, S. Y. Lee, and co-workers demonstrate the synthesis of homogeneousbiogenic paramagnetic nanoparticles inside recombinant E. coli cells by encapsul...
Mismatched pyrrolo-dC-modified duplex DNA as a novel probe for sensitive detection of silver ions Ki Soo Park ,  Joon Young Lee and Hyun Gyu Park  Chem. Commun., 2012, 48, 4549-4551 DOI: 10.1039/C2CC17148A Abstract A new technology that enables the highly selective and sensitive detection of silver ions has been developed. The method takes advantage of the unique fluorescence...