PMID- 28370454
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180718
LR  - 20200930
IS  - 1521-4095 (Electronic)
IS  - 0935-9648 (Linking)
VI  - 29
IP  - 22
DP  - 2017 Jun
TI  - Direct Free Carrier Photogeneration in Single Layer and Stacked Organic 
      Photovoltaic Devices.
LID - 10.1002/adma.201606909 [doi]
AB  - High performance organic photovoltaic devices typically rely on type-II P/N 
      junctions for assisting exciton dissociation. Heremans and co-workers recently 
      reported a high efficiency device with a third organic layer which is spatially 
      separated from the active P/N junction; but still contributes to the carrier 
      generation by passing its energy to the P/N junction via a long-range exciton 
      energy transfer mechanism. In this study the authors show that there is an 
      additional mechanism contributing to the high efficiency. Some bipolar materials 
      (e.g., subnaphthalocyanine chloride (SubNc) and subphthalocyanine chloride 
      (SubPc)) are observed to generate free carriers much more effectively than 
      typical organic semiconductors upon photoexcitation. Single-layer devices with 
      SubNc or SubPc sandwiched between two electrodes can give power conversion 
      efficiencies 30 times higher than those of reported single-layer devices. In 
      addition, internal quantum efficiencies (IQEs) of bilayer devices with opposite 
      stacking sequences (i.e., SubNc/SubPc vs SubPc/SubNc) are found to be the sum of 
      IQEs of single layer devices. These results confirm that SubNc and SubPc can 
      directly generate free carriers upon photoexcitation without assistance from a 
      P/N junction. These allow them to be stacked onto each other with reversible 
      sequence or simply stacking onto another P/N junction and contribute to the 
      photocarrier generation.
CI  - (c) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
FAU - Chandran, Hrisheekesh Thachoth
AU  - Chandran HT
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
FAU - Ng, Tsz-Wai
AU  - Ng TW
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
AD  - City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518000, P. R. 
      China.
FAU - Foo, Yishu
AU  - Foo Y
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and 
      Materials Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China.
FAU - Li, Ho-Wa
AU  - Li HW
AD  - Department of Physics and Material Sciences, City University of Hong Kong, Hong 
      Kong SAR, P. R. China.
FAU - Qing, Jian
AU  - Qing J
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
FAU - Liu, Xiao-Ke
AU  - Liu XK
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
FAU - Chan, Chiu-Yee
AU  - Chan CY
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
FAU - Wong, Fu-Lung
AU  - Wong FL
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
FAU - Zapien, Juan Antonio
AU  - Zapien JA
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and 
      Materials Sciences, City University of Hong Kong, Hong Kong SAR, P. R. China.
FAU - Tsang, Sai-Wing
AU  - Tsang SW
AD  - Department of Physics and Material Sciences, City University of Hong Kong, Hong 
      Kong SAR, P. R. China.
FAU - Lo, Ming-Fai
AU  - Lo MF
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
AD  - City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518000, P. R. 
      China.
FAU - Lee, Chun-Sing
AU  - Lee CS
AD  - Center of Super-Diamond and Advanced Films (COSDAF), Department of Chemistry, 
      City University of Hong Kong, Hong Kong SAR, P. R. China.
AD  - City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518000, P. R. 
      China.
LA  - eng
PT  - Journal Article
DEP - 20170403
PL  - Germany
TA  - Adv Mater
JT  - Advanced materials (Deerfield Beach, Fla.)
JID - 9885358
OTO - NOTNLM
OT  - free carrier generation
OT  - organic photovoltaics
OT  - single-layer device
EDAT- 2017/04/04 06:00
MHDA- 2017/04/04 06:01
CRDT- 2017/04/04 06:00
PHST- 2016/12/21 00:00 [received]
PHST- 2017/04/04 06:00 [pubmed]
PHST- 2017/04/04 06:01 [medline]
PHST- 2017/04/04 06:00 [entrez]
AID - 10.1002/adma.201606909 [doi]
PST - ppublish
SO  - Adv Mater. 2017 Jun;29(22). doi: 10.1002/adma.201606909. Epub 2017 Apr 3.