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New Hybrid Hole Extraction Layer of Perovskite Solar Cells with a Planar p–i–n Geometry
Park, Ik Jae,Park, Min Ah,Kim, Dong Hoe,Park, Gyeong Do,Kim, Byeong Jo,Son, Hae Jung,Ko, Min Jae,Lee, Doh-Kwon,Park, Taiho,Shin, Hyunjung,Park, Nam-Gyu,Jung, Hyun Suk,Kim, Jin Young American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.49
<P>We report a highly efficient p–i–n type planar perovskite solar cell with a hybrid PEDOT/NiO<SUB><I>x</I></SUB> hole-extraction layer. It has been found that the perovskite solar cell with a NiO<SUB><I>x</I></SUB> thin film as a hole-extraction layer generally exhibits lower fill factor compared to the conventionally used PEDOT:PSS thin film, whereas it shows higher photocurrent and photovoltage. The fill factor of the NiO<SUB><I>x</I></SUB>-based perovskite solar cell can be significantly improved by treating the NiO<SUB><I>x</I></SUB> surface with a dilute PEDOT solution. The photoluminescence quenching study and impedance spectroscopic (IS) analysis have revealed that the hole injection at the perovskite/NiO<SUB><I>x</I></SUB> interface is significantly facilitated with the PEDOT treatment, which should lead to the increased fill factor. As a result, the p–i–n type planar perovskite solar cell with the new hybrid hole-extraction layer exhibits a high conversion efficiency of 15.1% without the hysteresis effect.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-49/acs.jpcc.5b09322/production/images/medium/jp-2015-093225_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5b09322'>ACS Electronic Supporting Info</A></P>
Park, Sung-Hae,Song, In Young,Lim, Jongchul,Kwon, Young Soo,Choi, Jongmin,Song, Seulki,Lee, Jae-Ryung,Park, Taiho The Royal Society of Chemistry 2013 Energy & environmental science Vol.6 No.5
<P>A series of liquid junction dye-sensitized solar cells (DSCs) was fabricated based on polymer membrane-encapsulated dye-sensitized TiO<SUB>2</SUB> nanoparticles, prepared using a surface-induced cross-linking polymerization reaction, to investigate the dependence of the solar cell performance on the encapsulating membrane layer thickness. The ion conductivity decreased as the membrane thickness increased; however, the long term-stability of the devices improved with increasing membrane thickness. Nanoparticles encapsulated in a thick membrane (<I>ca.</I> 37 nm), obtained using a 90 min polymerization time, exhibited excellent pore filling among TiO<SUB>2</SUB> particles. This nanoparticle layer was used to fabricate a thin-layered, quasi-solid state DSC. The thick membrane prevented short-circuit paths from forming between the counter and the TiO<SUB>2</SUB> electrode, thereby reducing the minimum necessary electrode separation distance. The quasi-solid state DSC yielded a high power conversion efficiency (7.6 → 8.1%) and excellent stability during heating at 65 °C over 30 days. These performance characteristics were superior to those obtained from a conventional DSC (7.5 → 3.5%) prepared using a TiO<SUB>2</SUB> active layer with the same thickness. The reduced electrode separation distance shortened the charge transport pathways, which compensated for the reduced ion conductivity in the polymer gel electrolyte. Excellent pore filling on the TiO<SUB>2</SUB> particles minimized the exposure of the dye to the liquid and reduced dye detachment.</P> <P>Graphic Abstract</P><P>The multifuntional network polymer membrane electrolyte for a thin layered device provides short charge transport pathways, better performances, and excellent long-term stability. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3ee24496b'> </P>
Park, Yoon-Cheol,Chang, Yong-June,Kum, Byung-Gon,Kong, Eui-Hyun,Son, Jong Yeog,Kwon, Young Soo,Park, Taiho,Jang, Hyun Myung Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.26
<P>Size-tunable mesoporous spherical TiO<SUB>2</SUB> (MS TiO<SUB>2</SUB>) with a surface area of ∼110 m<SUP>2</SUP> g<SUP>−1</SUP> have been prepared through combination of “dilute mixing”-driven hydrolysis of titanium(iv) tetraethoxide and solvothermal treatment. The hierarchically structured MS TiO<SUB>2</SUB> are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen sorption analysis. Using three different MS TiO<SUB>2</SUB> (587, 757, and 1554 nm in diameter) as a scattering overlayer on a transparent nanocrystalline TiO<SUB>2</SUB> film, bi-layered dye-sensitized solar cells (DSCs) have been fabricated. Since the MS TiO<SUB>2</SUB> particles are comprised of ∼10 nm nanocrystallites that cluster together to form large secondary spheres, they can function as light scatterers without sacrificing the surface area for dye-uptake. As a result, the present MS TiO<SUB>2</SUB>-based cells perform a noticeable improvement in the overall efficiency: maximum 9.37% <I>versus</I> 6.80% for the reference cell made of a TiO<SUB>2</SUB> nanocrystalline film. This extraordinary result is attributed to the dual effects of enhanced dye loading and light scattering.</P> <P>Graphic Abstract</P><P>Dye-sensitized solar cells made with the size-tunable mesoporous spherical TiO<SUB>2</SUB> as a scattering overlayer exhibit a noticeable improvement in the overall efficiency: maximum 9.37%. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm11043h'> </P>
Thermally stable, planar hybrid perovskite solar cells with high efficiency
Choi, Kyoungwon,Lee, Junwoo,Kim, Hong Il,Park, Cheol Woong,Kim, Guan-Woo,Choi, Hyuntae,Park, Sungjin,Park, Sang Ah,Park, Taiho The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.11
<P>We report a highly effective interface engineering strategy for thermally stable perovskite solar cells (PSCs) by employing a zwitterion-modified SnO2 electron transport layer (ETL) and a dopant-free hole transport layer (HTL). A zwitterionic compound, 3-(1-pyridinio)-1-propanesulfonate, is used to modify the SnO2 ETL. The zwitterion, which forms interfacial dipoles, plays a few important roles: (1) it causes shifts in the work function of SnO2 resulting in more efficient charge extraction and an increase in the built-in potential. (2) It pulls electrons from perovskite layers to the ETL/perovskite interface, enhancing the electron transport ability. (3) Interfacial dipoles prevent back transfer of electrons from the ETL to the perovskite and suppress charge recombination. (4) Positively charged atoms in the zwitterion passivate Pb-I antisite defects, improving the stability of devices. With these desirable properties, the PSC with doped Spiro-OMeTAD obtained a power conversion efficiency of 21.43%. In addition, the PSC with the dopant-free HTL exhibited a record high efficiency of 20.5% among dopant-free polymeric HTLs using green solvents. The resulting PSCs without encapsulation showed excellent thermal stability. Accordingly, this work suggests that the use of a modified ETL and a dopant-free HTL is a promising strategy to overcome the thermal instability of planar-PSCs (P-PSCs).</P>