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organic solar cell

Yuelin Peng, Gokul V Govindaraju, Dong Ki Lee, Kyoung-Shin Choi, Trisha L Andrew
We report an unassisted solar water splitting system powered by a diketopyrrolopyrrole (DPP)-containing semi-transparent organic solar cell. Two major merits of this fullerene-free solar cell enable its integration with a BiVO4 photoanode. First is the high open circuit voltage and high fill factor displayed by this single junction solar cell, which yields sufficient power to effect water splitting when serially-connected to an appropriate electrode/catalyst. Second, the wavelength-resolved photoaction spectrum of the DPP-based solar cell has minimal overlap with that of the BiVO4 photoanode, thus ensuring that light collection across these two components can be optimized...
June 21, 2017: ACS Applied Materials & Interfaces
Junting Wang, Heng Wu, Linrui Jin, Jing Zhang, Yi Yuan, Peng Wang
The continuing efforts of creating novel polycyclic aromatic hydrocarbons (PAHs) and exploiting them as the crucial building-blocks of organic donor-acceptor (D-A) dyes with excellent excited state features, should bring an unprecedented chance for the improvement of power conversion efficiency (PCE) of dye-sensitized solar cells (DSCs). In this paper we report a nonacyclic aromatic hydrocarbon, N-annulated benzoindenopentaphene (NBIP), which can be tethered with multiple solubilizing groups including one 2-hexyldecyl, one 2-hexyldecyloxy, and four 4-hexylphenyl substituents...
June 20, 2017: ChemSusChem
Ilario Gelmetti, Lydia Cabau, Núria F Montcada, Emilio Palomares
We have fabricated MAPI solar cells using as selective contacts PEDOT:PSS polymer for holes and PCBM-C70 fullerene derivative for electrons. The thickness of MAPI, PCBM-C70, and PEDOT:PSS layers has been varied in order to evaluate the contribution of each layer to the final device performance. We have measured the devices capacitance under illumination and the charge carrier's lifetime using photoinduced time-resolved techniques. The results show that in this kind of devices the limiting layer is the PCBM-C70 due to its relative reduced mobility compared to PEDOT:PSS that makes the control of the fullerene thickness crucial for device optimization...
June 21, 2017: ACS Applied Materials & Interfaces
Xindong Wang, Rashid R Valiev, Tymish Y Ohulchanskyy, Hans Ågren, Chunhui Yang, Guanying Chen
Lanthanide-doped upconversion nanoparticles (UCNPs) are promising for applications as wide as biological imaging, multimodal imaging, photodynamic therapy, volumetric displays, and solar cells. Yet, the weak and narrow absorption of lanthanide ions poses a fundamental limit of UCNPs to withhold their brightness, creating a long-standing hurdle for the field. Dye-sensitized UCNPs are emerging to address this performance-limiting problem, yielding up to thousands-fold brighter luminescence than conventional UCNPs without dye sensitization...
June 16, 2017: Chemical Society Reviews
Sylvia J Lou, Jodi M Szarko, Tao Xu, Luping Yu, Tobin J Marks, Lin X Chen
No abstract text is available yet for this article.
June 14, 2017: Journal of the American Chemical Society
Lihua Zhi, Xiaofan Zeng, Hao Wang, Jun Hai, Xiangliang Yang, Baodui Wang, Yanhong Zhu
The development of sensitive and reliable methods to monitor the presence of mercuric ions in cells and organisms is of great importance to biological research and biomedical applications. In this work, we propose a strategy to construct a solar-driven nanoprobe using a 3D Au@MoS2 heterostructure as a photocatalyst and rhodamine B (RhB) as a fluorescent and color change reporter molecule for monitoring Hg2+ in living cells and animals. The sensing mechanism is based on the photoinduced electron formation of gold amalgam in the 3D Au@MoS2 heterostructure under visible light illumination...
June 14, 2017: Analytical Chemistry
Like Huang, Xiaoxiang Sun, Chang Li, Jie Xu, Rui Xu, Yangyang Du, Jian Ni, Hongkun Cai, Juan Li, Ziyang Hu, Jianjun Zhang
Recently, low-temperature solution-processed tin oxide (SnO2) as versatile electron transport layer (ETL) for efficient and robust planar heterojunction (PH) perovskite solar cells (PSCs) has attracted particular attention due to its outstanding properties such as high optical transparency, high electron mobility, and suitable band alignment. However, for most of the reported works, an annealing temperature of 180 °C is generally required. This temperature can reluctantly said to be a low temperature, especially with respect to the flexible application where 180 °C is still a little too high that PET flexible substrate cannot bear...
June 14, 2017: ACS Applied Materials & Interfaces
R Srinivasa Rao, Anirban Bagui, G Hanumantha Rao, Vinay Gupta, Surya Prakash Singh
A novel boron dipyrromethene based dye, coded as BODIPY-DTF, decorated with dithiafulvalene wings has been developed for solar cell application. A very high efficiency of 7.2% has been achieved, which is the highest reported value so far for BODIPY based donors. A remarkable value of about 88.1% of external quantum efficiency has also been observed at 371 nm.
June 22, 2017: Chemical Communications: Chem Comm
Alexander Wagenpfahl
Modern solar cell technologies are coined by the effort to enhance power conversion efficiencies. Limiting influences are manifold. Undoubtedly, the loss of electrical charge carriers, the charge carrier recombination, is one of the most prominent process which may lead to such limitations. In the field of organic solar cells with rather low charge carrier mobilities, the encounter of two charge carriers has turned out to be the limiting factor for charge carrier recombination. The recombination process strongly depends on the charge carrier mobilities...
June 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Lin Yuan, Robert Patterson, Xiaoming Wen, Zhilong Zhang, Gavin Conibeer, Shujuan Huang
Cesium lead halide (CsPbX3, X=Cl, Br, I) perovskites are a new material system that has attracted a lot of research focus. Its tunable band gap and better thermal stability than organic lead halide perovskite give it the potential for applications in optoelectronic devices such as light-emitting diodes and solar cells. Here we have synthesized CsPbBr3-xIx perovskite quantum dots (QDs) via a solution process, and then have selected three different anti-solvents to purify the product. A significant effect on optical properties of CsPbBr3-xIx was found after the centrifugation process...
June 7, 2017: Journal of Colloid and Interface Science
Wei Wang, Cenqi Yan, Tsz-Ki Lau, Jiayu Wang, Kuan Liu, Yan Fan, Xinhui Lu, Xiaowei Zhan
A fused hexacyclic electron acceptor, IHIC, based on strong electron-donating group dithienocyclopentathieno[3,2-b]thiophene flanked by strong electron-withdrawing group 1,1-dicyanomethylene-3-indanone, is designed, synthesized, and applied in semitransparent organic solar cells (ST-OSCs). IHIC exhibits strong near-infrared absorption with extinction coefficients of up to 1.6 × 10(5) m(-1) cm(-1) , a narrow optical bandgap of 1.38 eV, and a high electron mobility of 2.4 × 10(-3) cm(2) V(-1) s(-1) . The ST-OSCs based on blends of a narrow-bandgap polymer donor PTB7-Th and narrow-bandgap IHIC acceptor exhibit a champion power conversion efficiency of 9...
June 13, 2017: Advanced Materials
Jae Keun Nam, Myung Sun Jung, Sung Uk Chai, Yung Ji Choi, Dongho Kim, Jong Hyeok Park
Thermal instability of organic-inorganic hybrid perovskites will be an inevitable hurdle for commercialization. Recently, all-inorganic cesium lead halide perovskites, in particular, CsPbI2Br, have emerged as thermally stable and efficient photovoltaic light absorbers. However, the fundamental properties of this material have not been studied in detail. The crystal formation behavior of CsPbI2Br is investigated by examining the surface morphology, crystal structure, and chemical state of the perovskite films...
June 14, 2017: Journal of Physical Chemistry Letters
Chunyu Liu, Dezhong Zhang, Zhiqi Li, Xinyuan Zhang, Wenbin Guo, Liu Zhang, Shengping Ruan, Yongbing Long
To overcome drawbacks of the electron transport layer, such as complex surface defects and unmatched energy levels, we successfully employed a smart semiconductor-metal interfacial nanojunciton in organic solar cells by evaporating an ultrathin Al interlayer onto annealing-free ZnO electron transport layer, resulting in a high fill factor of 73.68% and power conversion efficiency of 9.81%. The construction of ZnO-Al nanojunction could effectively fill the surface defects of ZnO and reduce its work function because of the electron transfer from Al to ZnO by Fermi level equilibrium...
June 21, 2017: ACS Applied Materials & Interfaces
Moustafa El Kass, Brohan Luc, Nicolas Gautier, Solène Béchu, Céline David, Noëlla Lemaitre, Solenn Berson, M Richard-Plouet
Using reflux method with [Ti8O12(H2O)24]Cl8.HCl.7H2O as titanium precursor at 120°C for 24h leads to produce a transparent colloidal solution of nanosized crystallised anatase TiO2. The adjustment of the particle size and composition of the dispersant is monitored through the initial water content while controlling the conversion of propylene carbonate into propylene glycol occuring during reflux. The solutions were processed as thin films in order to produce electron transporting layers in hybrid bulk heterojunction solar cells, using a blend of P3HT-PCBM polymers as absorbers, in inverted architecture...
June 12, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Ji Hoon Seo, Inchan Hwang, Han-Don Um, Sojeong Lee, Kangmin Lee, Jeonghwan Park, Hyeonoh Shin, Tae-Hyuk Kwon, Seok Ju Kang, Kwanyong Seo
Transparent conducting electrodes (TCEs) are considered to be an essential structural component of flexible organic solar cells (FOSCs). Silver nanowire (AgNW) electrodes are widely used as TCEs owing to their excellent electrical and optical properties. The fabrication of AgNW electrodes has faced challenges in terms of forming large uniform interconnected networks so that high conductivity and reproducibility can be achieved. In this study, a simple method for creating an intimate contact between AgNWs that uses cold isostatic pressing (CIP) is demonstrated...
June 12, 2017: Advanced Materials
Weiwei Meng, Xiaoming Wang, Zewen Xiao, Jianbo Wang, David B Mitzi, Yanfa Yan
Using density functional theory calculations, we analyze the optical absorption properties of lead (Pb)-free metal halide perovskites (AB(2+)X3) and double perovskites (A2B(+)B(3+)X6) (A = Cs or monovalent organic ion, B(2+) = non-Pb divalent metal, B(+) = monovalent metal, B(3+) = trivalent metal, X = halogen). We show that if B(2+) is not Sn or Ge, Pb-free metal halide perovskites exhibit poor optical absorptions because of their indirect band gap nature. Among the nine possible types of Pb-free metal halide double perovskites, six have direct band gaps...
June 16, 2017: Journal of Physical Chemistry Letters
Jie Zhang, Yinan Zhang, Tao Song, Xinlei Shen, Xuegong Yu, Shuit-Tong Lee, Baoquan Sun, Baohua Jia
Organic-inorganic hybrid solar cells based on n-type crystalline silicon and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) exhibited promising efficiency along with low-cost fabrication process. In this work, ultra-thin flexible silicon substrates with a thickness down to tens of micrometers were employed to fabricate hybrid solar cells to reduce the usage of silicon materials. In order to improve light trapping ability, nanostructures were built-up on the thin silicon substrates by metal assisted chemical etching method...
June 12, 2017: ACS Applied Materials & Interfaces
Peng Song, Qiao Zhou, Yuanzuo Li, Fengcai Ma, Mengtao Sun
In this work, vibration-resolved photoinduced electron transfer of an organic conjugated DA system subjected to an external electric field was theoretically investigated. The ground and excited state vibrational relaxation energies were quantitatively characterized. The effective high frequency, ω(eff), could be estimated from the variation in energy of the excited-state equilibrium geometries of acceptor and donor sites as well as the analysis of the vibrational modes upon electron transfer. For a PCDTBT:PC70BM blend in an external electric field, the vibronic modes affected the charge separation process differently from the charge recombination process...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
Cheng Bi, Bo Chen, Haotong Wei, Stephan DeLuca, Jinsong Huang
Organic-inorganic hybrid perovskites (OIHPs) are new photoactive layer candidates for lightweight and flexible solar cells due to their low-temperature process capability; however, the reported efficiency of flexible OIHP devices is far behind those achieved on rigid glass substrates. Here, it is revealed that the limiting factor is the different perovskite film deposition conditions required to form the same film morphology on flexible substrates. An optimized perovskite film composition needs a different precursor ratio, which is found to be essential for the formation of high-quality perovskite films with longer radiative carrier recombination lifetime, smaller density of trap states, reduced precursor residue, and uniform and pin-hole free films...
June 9, 2017: Advanced Materials
Inchan Hwang, Deokjae Choi, Sojeong Lee, Ji Hoon Seo, Ka-Hyun Kim, Ilsun Yoon, Kwanyong Seo
We designed and fabricated a random-size inverted-pyramid-structured polydimethylsiloxane (RSIPS-PDMS) sticker to enhance the light absorption of solar cells and thus increase their efficiency. The fabricated sticker was laminated onto bare glass and crystalline silicon (c-Si) surfaces; consequently, low solar-weighted reflectance values were obtained for these surfaces (6.88 and 17.2%, respectively). In addition, we found that incident light was refracted at the PDMS-air interface of each RSIPS, which redirected the incident power and significantly increased the optical path length in the RSIPS-PDMS sticker which was 14...
June 16, 2017: ACS Applied Materials & Interfaces
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