NDLI: Enhanced charge carrier transport properties in colloidal quantum dot solar cells <i>via</i> organic and inorganic hybrid surface passivation

Content Provider	Royal Society of Chemistry (RSC)
Author	Hou, Bo Cho, Yuljae Cha, SeungNam Park, Jong Bae Hong, John Lee, Juwon Lee, Sanghyo Sohn, Jung Inn Lim, Jongchul Giraud, Paul Lee, Young-Woo Kim, Jong Min Pak, Sangyeon Snaith, Henry J. Morris, Stephen M. Kim, Byung-Sung
Copyright Year	2016
Abstract	Colloidal quantum dots (CQDs) are extremely promising as photovoltaic materials. In particular, the tunability of their electronic band gap and cost effective synthetic procedures allow for the versatile fabrication of solar energy harvesting cells, resulting in optimal device performance. However, one of the main challenges in developing high performance quantum dot solar cells (QDSCs) is the improvement of the photo-generated charge transport and collection, which is mainly hindered by imperfect surface functionalization, such as the presence of surface electronic trap sites and the initial bulky surface ligands. Therefore, for these reasons, finding effective methods to efficiently decorate the surface of the as-prepared CQDs with new short molecular length chemical structures so as to enhance the performance of QDSCs is highly desirable. Here, we suggest employing hybrid halide ions along with the shortest heterocyclic molecule as a robust passivation structure to eliminate surface trap sites while decreasing the charge trapping dynamics and increasing the charge extraction efficiency in CQD active layers. This hybrid ligand treatment shows a better coordination with Pb atoms within the crystal, resulting in low trap sites and a near perfect removal of the pristine initial bulky ligands, thereby achieving better conductivity and film structure. Compared to halide ion-only treated cells, solar cells fabricated through this hybrid passivation method show an increase in the power conversion efficiency from 5.3% for the halide ion-treated cells to 6.8% for the hybrid-treated solar cells.
Starting Page	18769
Ending Page	18775
Page Count	7
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	48
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta06835a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Quantum tunnelling Solar cell Band gap Solar energy Quantum dot Halide Heterocyclic compound Passivation (chemistry) CQD Ligand Lead
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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