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High-Temperature–Short-Time Annealing Process for High-Performance Large-Area Perovskite Solar Cells
Kim, Minjin,Kim, Gi-Hwan,Oh, Kyoung Suk,Jo, Yimhyun,Yoon, Hyun,Kim, Ka-Hyun,Lee, Heon,Kim, Jin Young,Kim, Dong Suk American Chemical Society 2017 ACS NANO Vol.11 No.6
<P>Organic inorganic hybrid metal halide perovskite solar cells (PSCs) are attracting tremendous research interest due to their high solar-to-electric power conversion efficiency with a high possibility of cost-effective fabrication and certified power conversion efficiency now exceeding 22%. Although many effective methods for their application have been developed over the past decade, their practical transition to large-size devices has been restricted by difficulties in achieving high performance. Here we report on the development of a simple and cost-effective production method with high-temperature and short-time annealing processing to obtain uniform, smooth, and large size grain domains of perovskite films over large areas. With high-temperature short-time annealing at 400 degrees C for 4 s, the perovskite film with an average domain size of 1 pm was obtained, which resulted in fast solvent evaporation. Solar cells fabricated using this processing technique had a maximum power conversion efficiency exceeding 20% over a 0.1 cm(2) active area and 18% over a 1 cm(2) active area. We believe our approach will enable the realization of highly efficient large-area PCSs for practical development with a very simple and short-time procedure. This simple method should lead the field toward the fabrication of uniform large-scale perovskite films, which are necessary for the production of high-efficiency solar cells that may also be applicable to several other material systems for more widespread practical deployment.</P>
Fluorine Functionalized Graphene Nano Platelets for Highly Stable Inverted Perovskite Solar Cells
Kim, Gi-Hwan,Jang, Hyungsu,Yoon, Yung Jin,Jeong, Jaeki,Park, Song Yi,Walker, Bright,Jeon, In-Yup,Jo, Yimhyun,Yoon, Hyun,Kim, Minjin,Baek, Jong-Beom,Kim, Dong Suk,Kim, Jin Young American Chemical Society 2017 NANO LETTERS Vol.17 No.10
<P>Edged-selectively fluorine (F) functionalized graphene nanoplatelets (EFGnPs-F) with a p-i-n structure of perovskite solar cells achieved 82% stability relative to initial performance over 30 days of air exposure without encapsulation. The enhanced stability stems from F substitution on EFGnPs; fluorocarbons such as polytetrafluoroethylene are well-known for their superhydrophobic properties and being impervious to chemical degradation. These hydrophobic moieties tightly protect perovskite layers from air degradation. To directly compare the effect of similar hydrophilic graphene layers, edge-selectively hydrogen functionalized graphene nanoplatelet (EFGnPs-H) treated devices were tested under the same conditions. Like the pristine MAPbI(3) perovskite devices, EFGnPs-H treated devices were completely degraded after 10 days. The hydrophobic properties of EFGnPs-F were characterized by contact angle measurement. The test results showed great water repellency compared to pristine perovskite films or EFGnPs-H coated films. This resulted in highly air-stable p-i-n perovskite solar cells.</P>
Kim, Jin Hyun,Jo, Yimhyun,Kim, Ju Hun,Jang, Ji Wook,Kang, Hyun Jun,Lee, Young Hye,Kim, Dong Suk,Jun, Yongseok,Lee, Jae Sung American Chemical Society 2015 ACS NANO Vol.9 No.12
<P>A stand-alone, wireless solar water splitting device without external energy supply has been realized by combining in tandem a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite single junction solar cell with a cobalt carbonate (Co-Ci)-catalyzed, extrinsic/intrinsic dual-doped BiVO<SUB>4</SUB> (hydrogen-treated and 3 at% Mo-doped). The photoanode recorded one of the highest photoelectrochemical water oxidation activity (4.8 mA/cm<SUP>2</SUP> at 1.23 V<SUB>RHE</SUB>) under simulated 1 sun illumination. The oxygen evolution Co-Ci co-catalyst showed similar performance to best known cobalt phosphate (Co-Pi) (5.0 mA/cm<SUP>2</SUP> at 1.23 V<SUB>RHE</SUB>) on the same dual-doped BiVO<SUB>4</SUB> photoanode, but with significantly better stability. A tandem artificial-leaf-type device produced stoichiometric hydrogen and oxygen with an average solar-to-hydrogen efficiency of 4.3% (wired), 3.0% (wireless) under simulated 1 sun illumination. Hence, our device based on a D4 tandem photoelectrochemical cell represents a meaningful advancement in performance and cost over the device based on a triple-junction solar cell-electrocatalyst combination.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-12/acsnano.5b03859/production/images/medium/nn-2015-03859j_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03859'>ACS Electronic Supporting Info</A></P>