PMID- 28401651
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20211015
IS  - 1613-6829 (Electronic)
IS  - 1613-6810 (Linking)
VI  - 13
IP  - 21
DP  - 2017 Jun
TI  - Trap-State Suppression and Improved Charge Transport in PbS Quantum Dot Solar 
      Cells with Synergistic Mixed-Ligand Treatments.
LID - 10.1002/smll.201700598 [doi]
AB  - The power conversion efficiency of colloidal PbS-quantum-dot (QD)-based solar 
      cells is significantly hampered by lower-than-expected open circuit voltage 
      (V(OC) ). The V(OC) deficit is considerably higher in QD-based solar cells 
      compared to other types of existing solar cells due to in-gap trap-induced bulk 
      recombination of photogenerated carriers. Here, this study reports a ligand 
      exchange procedure based on a mixture of zinc iodide and 3-mercaptopropyonic acid 
      to reduce the V(OC) deficit without compromising the high current density. This 
      layer-by-layer solid state ligand exchange treatment enhances the photovoltaic 
      performance from 6.62 to 9.92% with a significant improvement in V(OC) from 0.58 
      to 0.66 V. This study further employs optoelectronic characterization, X-ray 
      photoelectron spectroscopy, and photoluminescence spectroscopy to understand the 
      origin of V(OC) improvement. The mixed-ligand treatment reduces the sub-bandgap 
      traps and significantly reduces bulk recombination in the devices.
CI  - (c) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
FAU - Pradhan, Santanu
AU  - Pradhan S
AD  - ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and 
      Technology, 08860, Castelldefels (Barcelona), Spain.
FAU - Stavrinadis, Alexandros
AU  - Stavrinadis A
AD  - ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and 
      Technology, 08860, Castelldefels (Barcelona), Spain.
FAU - Gupta, Shuchi
AU  - Gupta S
AD  - ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and 
      Technology, 08860, Castelldefels (Barcelona), Spain.
FAU - Bi, Yu
AU  - Bi Y
AD  - ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and 
      Technology, 08860, Castelldefels (Barcelona), Spain.
FAU - Di Stasio, Francesco
AU  - Di Stasio F
AD  - ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and 
      Technology, 08860, Castelldefels (Barcelona), Spain.
FAU - Konstantatos, Gerasimos
AU  - Konstantatos G
AD  - ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and 
      Technology, 08860, Castelldefels (Barcelona), Spain.
AD  - ICREA-Institucio Catalana de Recerca i Estudis Avancats, Passeig Lluis Companys 
      23, 08010, Barcelona, Spain.
LA  - eng
GR  - 725165/ERC_/European Research Council/International
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20170412
PL  - Germany
TA  - Small
JT  - Small (Weinheim an der Bergstrasse, Germany)
JID - 101235338
OTO - NOTNLM
OT  - VOC deficit
OT  - quantum dots
OT  - recombination
OT  - solar cells
OT  - surface passivation
EDAT- 2017/04/13 06:00
MHDA- 2017/04/13 06:01
CRDT- 2017/04/13 06:00
PHST- 2017/02/22 00:00 [received]
PHST- 2017/04/13 06:00 [pubmed]
PHST- 2017/04/13 06:01 [medline]
PHST- 2017/04/13 06:00 [entrez]
AID - 10.1002/smll.201700598 [doi]
PST - ppublish
SO  - Small. 2017 Jun;13(21). doi: 10.1002/smll.201700598. Epub 2017 Apr 12.