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Interface Engineering for High Efficient Non-fullerene Polymer Solar Cells
Shinuk Cho(조신욱),박수정,Febrian Tri Adhi Wibowo,오승환,장성연 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
In current, the low-conductivity PEDOT:PSS is mainly utilized in contemporary solar cells. Thus, the contact between ITO and PEDOT:PSS is not ohmic anymore. Despite the high possibility that there are serious interface problems, little attention has been paid to the interface between PEDOT:PSS and ITO. In this work, we have employed a conjugated polyelectrolyte (WPFSCz-) between ITO and low-σ PEDOT:PSS to overcome organic-inorganic interfacial problems. Insertion of the WPFSCz- layer provides substantial advantages in the operation of the polymer solar cells. First, WPFSCz- layer modifies the work-function of the ITO, thereby forming effective cascading energy alignment. Second, the WPFSCz- layer eliminates interfacial trap sites, resulting in an improvement of fill factor. These effects result in a significant increase in the efficiency of non-fullerene solar cells based on PM6 and Y6, from 15.86 to 17.34%.
Hadmojo, Wisnu Tantyo,Wibowo, Febrian Tri Adhi,Ryu, Du Yeol,Jung, In Hwan,Jang, Sung-Yeon American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.38
<P>Although the combination of wide band gap polymer donors and narrow band gap small-molecule acceptors achieved state-of-the-art performance as bulk heterojunction (BHJ) active layers for organic solar cells, there have been only several of the wide band gap polymers that actually realized high-efficiency devices over >10%. Herein, we developed high-efficiency, low-energy-loss fullerene-free organic solar cells using a weakly crystalline wide band gap polymer donor, PBDTTPD-HT, and a nonfullerene small-molecule acceptor, ITIC. The excessive intermolecular stacking of ITIC is efficiently suppressed by the miscibility with PBDTTPD-HT, which led to a well-balanced nanomorphology in the PBDTTPD-HT/ITIG BHJ active films. The favorable optical; electronic, and energetic properties of PBDTTPD-HT with respect to ITIC achieved panchromatic photon-to-current conversion with a remarkably low energy loss (0.59 eV).</P>
Azmi, Randi,Lee, Un-Hak,Wibowo, Febrian Tri Adhi,Eom, Seung Hun,Yoon, Sung Cheol,Jang, Sung-Yeon,Jung, In Hwan American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.41
<P>Porphyrin derivatives have recently emerged as hole transport layers (HTLs) because of their electron-rich characteristics. Although several successes with porphyrin-based HTLs have been recently reported, achieving excellent solar cell performance, the chances to improve this further by molecular engineering are still open. In this work, Zn porphyrin (P<SUB>Zn</SUB>)-based HTLs were developed by conjugating fluorinated triphenylamine (FTPA) wings at the perimeter of the P<SUB>Zn</SUB> core for low-temperature perovskite solar cells (L-PSCs). The fluorinated P<SUB>Zn</SUB>-HTLs (P<SUB>Zn</SUB>-2FTPA and P<SUB>Zn</SUB>-3FTPA) exhibited superior HTL properties compared to the nonfluorinated one (P<SUB>Zn</SUB>-TPA). Moreover, their deeper highest occupied molecular orbital energy levels were beneficial for boosting open-circuit voltages, and their enhanced face-on stacking improved the hole transport properties. The L-PSC using P<SUB>Zn</SUB>-2FTPA achieved the highest performance of 18.85%. Thus far, this result is one of the highest reported power conversion efficiencies among the PSCs using porphyrin-based HTLs.</P> [FIG OMISSION]</BR>
Eom, Seung Hun,Kim, Hee Su,Do, Hee Jin,Lee, Un-Hak,Wibowo, Febrian Tri Adhi,Hwang, Do-Hoon,Yoon, Sung Cheol,Jung, In Hwan Elsevier 2018 Dyes and pigments Vol.156 No.-
<P><B>Abstract</B></P> <P>Perylene diimide (PDI) based high bandgap acceptors, DTBTP, DTF2BTP, and DTF2TZP, are synthesized for use in fullerene-free organic solar cells. The two PDI rings are connected to the end of the n-type core, forming a PDI-n-type core-PDI structure. Several n-type core materials, 4,7-dithieno-2,1,3-benzothiadiazole (DTBT), 5,6-difluoro-4,7-dithieno-2,1,3-benzothiadiazole (DTF2BT), and 4,6-difluoro-2H-benzo[d][1,2,3]triazole (DTF2TZ), are incorporated in the PDI acceptors and the n-type core effect on photovoltaic properties is studies. The introduction of alkyl side chains onto the core structure weakened the intermolecular interaction, whereas fluorination of the core structure improved the backbone planarity and intermolecular ordering. DTF2BTP having a planar core structure without bulky alkyl chains yielded the best power conversion efficiency, 4.41%, when mixed with PTB7-Th donor. The n-type core structure was beneficial in terms of increasing the electron accepting properties and the absorption in the high bandgap region of non-fullerene acceptors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We synthesized novel n-type core incorporated perylene diimide (PDI) acceptors. </LI> <LI> Panchromatic absorption was achieved via high bandgap PDI acceptors and a low bandgap donor, PTB7-Th. </LI> <LI> The n-type core effect of non-fullerene acceptors was systemically analyzed by morphological studies. </LI> <LI> The fluorinated planar core structure provided the best PCE of 4.41%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>