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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>
High-Performance Near-Infrared Absorbing n-Type Porphyrin Acceptor for Organic Solar Cells
Hadmojo, Wisnu Tantyo,Lee, Un-Hak,Yim, Dajeong,Kim, Hyun Woo,Jang, Woo-Dong,Yoon, Sung Cheol,Jung, In Hwan,Jang, Sung-Yeon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.48
<P>While the outstanding charge transport and sunlight-harvesting properties of porphyrin molecules are highly attractive as active materials for organic photovoltaic (OPV) devices, the development of n-type porphyrin-based electron acceptors has been challenging. In this work, we developed a high-performance porphyrin-based electron acceptor for OPVs by substitution of four naphthalene diimide (NDI) units at the perimeter of a Zn-porphyrin (P<SUB>Zn</SUB>) core using ethyne linkage. Effective π-conjugation between four NDI wings and the <I>P</I><SUB>Zn</SUB> core significantly broadened Q-band absorption to the near infrared region, thereby achieving the narrow band gap of 1.33 eV. Employing a windmill-structured tetra-NDI substituted <I>P</I><SUB>Zn</SUB>-based acceptor (<I>P</I><SUB>Zn</SUB>-TNDI) and mid-band gap polymer donor (PTB7-Th), the bulk heterojunction OPV devices achieved a power conversion efficiency (PCE) of 8.15% with an energy loss of 0.61 eV. The PCE of our <I>P</I><SUB>Zn</SUB>-TNDI-based device was the highest among the reported OPVs using porphyrin-based acceptors. Notably, the amorphous characteristic of <I>P</I><SUB>Zn</SUB>-TNDI enabled optimization of the device performance without using any additive, which should make industrial fabrication simpler and cheaper.</P> [FIG OMISSION]</BR>
Artificial light-harvesting n-type porphyrin for panchromatic organic photovoltaic devices
Hadmojo, Wisnu Tantyo,Yim, Dajeong,Aqoma, Havid,Ryu, Du Yeol,Shin, Tae Joo,Kim, Hyun Woo,Hwang, Eojin,Jang, Woo-Dong,Jung, In Hwan,Jang, Sung-Yeon Royal Society of Chemistry 2017 Chemical Science Vol.8 No.7
<▼1><P>We developed a novel NIR-harvesting n-type porphyrin derivative, PDI–P<SUB>Zn</SUB>–PDI, that shows a low bandgap of 1.27 eV. Panchromatic absorption was extended to the NIR area with a significantly low energy loss of 0.54 eV which led to promising photovoltaic performance.</P></▼1><▼2><P>A near-infrared-harvesting n-type porphyrin-based acceptor for organic photovoltaics (OPVs) was developed. The n-type acceptor, PDI–P<SUB>Zn</SUB>–PDI, was designed by connecting a zinc porphyrin (P<SUB>Zn</SUB>) core to two perylenediimide (PDI) wings through ethyne bridges. A narrow bandgap of 1.27 eV was achieved through the extended π-conjugation and intramolecular charge transfer between the strongly electron-donating P<SUB>Zn</SUB> core and the electron-accepting PDI wings. A bulk heterojunction (BHJ) structured photovoltaic device fabricated from PDI–P<SUB>Zn</SUB>–PDI with PTB7-Th exhibited panchromatic photon-to-current conversion from 350 to 900 nm. A power conversion efficiency of 5.25% with a remarkably low <I>E</I><SUB>loss</SUB> of 0.54 eV was achieved by optimizing the nanomorphology of the BHJ films by adding pyridine and by controlling the ZnO/BHJ interfacial properties.</P></▼2>
Azmi, Randi,Hadmojo, Wisnu Tantyo,Sinaga, Septy,Lee, Chang-Lyoul,Yoon, Sung Cheol,Jung, In Hwan,Jang, Sung-Yeon Wiley-VCH 2018 ADVANCED ENERGY MATERIALS Vol.8 No.5
<P>Herein, this study reports high-efficiency, low-temperature ZnO based planar perovskite solar cells (PSCs) with state-of-the-art performance. They are achieved via a strategy that combines dual-functional self-assembled monolayer (SAM) modification of ZnO electron accepting layers (EALs) with sequential deposition of perovskite active layers. The SAMs, constructed from newly synthesized molecules with high dipole moments, act both as excellent surface wetting control layers and as electric dipole layers for ZnO-EALs. The insertion of SAMs improves the quality of PbI2 layers and final perovskite layers during sequential deposition, while charge extraction is enhanced via electric dipole effects. Leveraged by SAM modification, our low-temperature ZnO based PSCs achieve an unprecedentedly high power conversion efficiency of 18.82% with a V-OC of 1.13 V, a J(SC) of 21.72 mA cm(-2), and a FF of 0.76. The strategy used in this study can be further developed to produce additional performance enhancements or fabrication temperature reductions.</P>
Akbar, Zico Alaia,Oh, Ji Hye,Hadmojo, Wisnu Tantyo,Yang, Su Ji,Do, Young Rag,Jang, Sung-Yeong Optical Society of America 2015 Optics express Vol.23 No.19
<P>A unique, hierarchically structured, aggregated TiO<sub>2</sub> nanowire (A-TiO<sub>2</sub>-nw) is prepared by solvothermal synthesis and used as a dual-functioning photoelectrode in dye-sensitized solar cells (DSSCs). The A-TiO<sub>2</sub>-nw shows improved light scattering compared to conventional TiO<sub>2</sub> nanoparticles (TiO<sub>2</sub>-np) and dramatically enhanced dye adsorption compared to conventional scattering particles (CSP). The A-TiO<sub>2</sub>-nw is used as a scattering layer for bilayer photoelectrodes (TiO<sub>2</sub>-np/A-TiO<sub>2</sub>-nw) in DSSCs to compare the cell performance to that of devices using state-of-the-art photoelectrode architectures (TiO<sub>2</sub>-np/CSP). The DSSCs fabricated using bilayers of TiO<sub>2</sub>-np/A-TiO<sub>2</sub>-nw show improved power conversion efficiency (9.1%) and current density (14.88 mA cm<sup>-2</sup>) compared to those using single-layer TiO<sub>2</sub>-np (7.6% and 11.84 mA cm<sup>-2</sup>) or TiO<sub>2</sub>-np/CSP bilayer structures (8.7% and 13.81 mA cm<sup>-2</sup>). The unique contribution of the A-TiO<sub>2</sub>-nw layers to the device performance is confirmed by studying the incident photon-to-current efficiency. The enhanced external quantum efficiencies at approximately 520 nm and 650 nm clearly reveal the dual functionality of A-TiO<sub>2</sub>-nw. These unique properties of A-TiO<sub>2</sub>-nw may be applied in other devices utilizing light-scattering n-type semiconductor.</P>