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Kim, Min,Lee, Jaewon,Sin, Dong Hun,Lee, Hansol,Woo, Han Young,Cho, Kilwon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.30
<P>Ternary blending is an effective strategy for broadening the absorption range of the active layer in bulk heterojunction polymer solar cells and for constructing an efficient cascade energy landscape at the donor/acceptor interface to achieve high efficiencies. In this study, we report efficient ternary blend solar cells containing an acceptor alloy consisting of the indacenodithiophene-based nonfullerene material, IDT2BR, and the fullerene material, phenyl-C<SUB>71</SUB>-butyric acid methyl ester (PC<SUB>71</SUB>BM). The IDT2BR materials mix fully with PC<SUB>71</SUB>BM materials, and the energy state of this phase can be tuned by varying the blending ratio. We performed photoluminescence and external quantum efficiency studies and found that the ternary charge cascade structure efficiently transfers the photogenerated charges from the polymer to IDT2BR and finally to PC<SUB>71</SUB>BM materials. Ternary blend devices containing the IDT2BR:PC<SUB>71</SUB>BM acceptor blend and various types of donor polymers were found to exhibit power conversion efficiencies (PCEs) improved by more than 10% over the PCEs of the binary blend devices.</P> [FIG OMISSION]</BR>
Ternary Organic Photovoltaics Prepared by Sequential Deposition of Single Donor and Binary Acceptors
Cho, Yunju,Nguyen, Thanh Luan,Oh, Hyerim,Ryu, Ka Yeon,Woo, Han Young,Kim, Kyungkon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.33
<P>Binary organic photovoltaics (OPVs) fabricated by single-step (SS) deposition of a binary blend of polymer (or small molecule) donor and fullerene acceptor (SS binary OPV) are widely utilized. To improve the OPV performance, SS ternary OPVs utilizing a ternary blend consisting of two (or one) electron donor(s) and one (or two) electron acceptor(s) have been studied. SS ternary OPVs require more sensitive and complex optimization processes to optimize bulk heterojunctions with bicontinuous nanoscale phase separation of the donor and acceptor. We demonstrated a novel ternary OPV fabricated by sequential (SQ) deposition of a single polymer donor and a binary mixture consisting of a phenyl-C<SUB>71</SUB>-butyric acid methyl ester (PCBM) and nonfullerene acceptor, 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-<I>d</I>:2,3′-<I>d</I>′]-<I>s</I>-indaceno[1,2-<I>b</I>:5,6-<I>b</I>′]dithiophene (ITIC). In the SQ ternary OPV, PCBM effectively created a bicontinuous pathway for charge transport with a polymer, and ITIC mainly enhanced light absorption and photovoltage. This complementary effect was not observed in an SS ternary OPV utilizing the same donor and acceptors. Due to these complementary effects, the SQ ternary OPV exhibited a power conversion efficiency of 6.22%, which was 52 and 37% higher than that of the SQ binary OPV and the SS ternary OPV, respectively. In addition, the thermal stability of the SQ ternary OPV was found to be superior to that of the SS ternary OPV.</P> [FIG OMISSION]</BR>
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>
Hong, Jisu,Ha, Yeon Hee,Cha, Hyojung,Kim, Ran,Kim, Yu Jin,Park, Chan Eon,Durrant, James R.,Kwon, Soon-Ki,An, Tae Kyu,Kim, Yun-Hi American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.51
<P>A series of naphthalene diimide (NDI)-based small molecules were synthesized as nonfullerene acceptors and incorporated in all-small-molecule solar cells. Three NDI-based small molecules, NDICN-T, NDICN-BT, and NDICN-TVT, were designed with different linkers between two NDI units to induce the different conjugation length and modulate the geometric structures of the NDI dimers. The small NDI-based dimer electron acceptors with slip-stacked structures that facilitate pi-pi stacking interactions and/or hinder excessive aggregation exhibited different morphological behaviors, such as miscibility or crystallinity in bulk heterojunction blends with 7,7'-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-bldithiophene-2,6-diyl)bis(6-fluoro-4-(5'-hexyl-[2,2'-bi-thiophen]-5-y1)benzo[c][1,2,5]thiadiazole) (DTS-F) electron donors. The photovoltaic devices prepared with NDICN-TVT gave the highest power conversion efficiency (PCE) of 3.01%, with an open-circuit voltage (V-oc) of 0.75 V, a short-circuit current density (J(sc)) of 7.10 mA cm(-2), and a fill factor of 56.2%, whereas the DTS-F:NDICN-T and DTS-F:NDICN-BT devices provided PCEs of 1.81 and 0.13%, respectively. Studies of the charge-generation properties, charge-transfer dynamics, and charge-transport properties for understanding the structure-property relations revealed that DTS-F:NDICN-TVT blend films with well developed domains and well-ordered crystalline structures performed well, whereas an excessive miscibility between DTS-F and NDICN-BT disrupted the crystallinity of the material and yielded a poor device performance.</P>
Kwon, O.K.,Park, J.H.,Park, S.Y. Elsevier Science 2016 ORGANIC ELECTRONICS Vol.30 No.-
A new structure of dicyanodistyrylbenzene-naphthalimide-based nonfullerene acceptor NIDCSN was synthesized and characterized to have a favorable electron accepting property and versatile processability in various organic solvents. The nonfullerene all-small-molecule solar cells comprising p-DTS(FBTTh<SUB>2</SUB>)<SUB>2</SUB> as the donor and NIDCSN as the acceptor exhibited a maximum power conversion efficiency of 3.45% with a remarkable open-circuit voltage of 1.04 V, together with similar device performances when fabricated in five different solvents including environmentally benign non-halogenated ones.
Electron Acceptors in Organic Solar Cells
공재민,남상용,Kong, Jaemin,Nam, Sang-Yong The Korean Society of Industrial and Engineering C 2022 공업화학 Vol.33 No.2
최근 유기태양전지의 효율이 18%를 넘어섰다. 이러한 급속한 효율의 증가는 전자 주개 고분자와 짝을 이루는 전자 받개 물질의 개발과 깊은 연관성을 가지고 있다. 이 미니 리뷰에서는 전자 받개 물질의 개발 과정을 통해 유기태양전지의 발전 양상을 살펴본다. 본 리뷰의 첫 번째 파트에서는 유기태양전지 발전의 전반부를 이끌었던 풀러렌 기반 전자 받개 물질에 대해 살펴본다. 그리고 두 번째 파트에서는 풀러렌 기반 전자 받개 물질의 단점들을 극복할 잠재력을 가지고 있으며, 유기태양전지에 새로운 전기를 가져다 준 비(非)플러렌 기반 전자 받개 물질에 대해서 소개한다. 마지막 파트에서는 리뷰의 전체적인 요약과 더불어 20% 효율을 넘어설 전략에 대해 간단히 논의하며 본 리뷰를 마무리한다.
고성능 유기태양전지 개발을 위한 비풀러렌 소재 기술 연구동향
이맹강,정연욱,이재원 한국화상학회 2022 한국화상학회지 Vol.28 No.3
최근 비풀러렌 전자수용체 소재 개발로 태양전지 및 광검출기 등 유기광다이오드 분야의 상당한 진보를 나타내고 있 다. 비풀러렌 소재의 자유로운 구조 개질 가능성을 바탕으로 흡광대역 자유 제어가 가능한 장점으로, 기존 태양전지 에서 구현이 힘들었던 고성능 반투명 태양전지, 실내 저조도 태양전지, 파장선택적 광검출기 등 다양한 응용을 가능 하게 한다. 본 리뷰에서는 유기태양전지를 비롯한 유기광다이오드의 광활성층에 활용되는 유기반도체 소재의 최신 연 구동향에 대해 다루고자 한다. Recently, the development of non-fullerene electron acceptor materials shows a significant progress in the field of organic photodiodes such as solar cells and photodetectors. With the advantage of being able to finely tune the optical bandgap based on the possibility of flexible structural modification, it enables various applications such as high-performance semitransparent device platform, indoor energy harvesting, and wavelength-selective photodetection, which were difficult to implement in conventional solar cells. In this review, we would like to discuss the latest research trends of organic semiconducting materials used in the photoactive layer of organic photodiodes.