01804nas a2200265 4500008004100000022001400041245013000055210006900185260010600254300001000360490000800370520077000378653001701148653002101165653002701186653001901213100002801232700002401260700002001284700002301304700002401327700002701351700002901378856013101407 2015 eng d a0038-092X00aEnhancing efficiency of perovskite solar cell via surface microstructuring: superior grain growth and light harvesting effect0 aEnhancing efficiency of perovskite solar cell via surface micros aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB a12-190 v1123 a

We have introduced a novel approach to enhance the perovskite solar cell efficiency by controlling the grain growth and light harvesting properties of perovskite crystallites. Instead of using a mesoporous TiO2 layer, we have modified the surface microstructuring of the TiO2 film by dispensing nano assembled TiO2 submicron structures (nanobeads, NBs) on TiO2 compact layer. With this new approach solar cell efficiency was improved significantly through an increase in both J(sc) and V-oc. This high efficiency is attributed to crystallite size of the perovskite phase. These also act as light scattering centers giving higher current density and reduced recombination effects giving higher open circuit voltage. (C) 2014 Elsevier Ltd. All rights reserved.

10aGrain growth10aLight harvesting10aPerovskite solar cells10aTiO2 nanobeads1 aTathavadekar, Mukta, C.1 aAgarkar, Shruti, A.1 aGame, Onkar, S.1 aBansode, Umesh, P.1 aKulkarni, Sneha, A.1 aMhaisalkar, Subodh, G.1 aOgale, Satishchandra, B. uhttps://library.ncl.res.in/content/enhancing-efficiency-perovskite-solar-cell-surface-microstructuring-superior-grain-growth-002444nas a2200265 4500008004100000022001400041245016500055210006900220260000900289300001600298490000600314520147000320653001501790653002401805653002501829653002801854653002301882653002701905100002301932700001901955700002001974700002601994700002702020856013102047 2022 eng d a2574-096200aDual-functional 3-acetyl-2,5-dimethylthiophene additive-assisted crystallization control and trap state passivation for high- performance perovskite solar cells0 aDualfunctional 3acetyl25dimethylthiophene additiveassisted cryst cDEC  a14701-147110 v53 a

Defect-mediated charge recombination and successive degradation mainly lag the performance of perovskite solar cells (PSCs). Insufficiency or evaporation of organic cations leaves behind the undercoordinated Pb2+ ions, which act as severe charge recombination centers. Herein, theoretical and experimental insights into crystallization control and defect passivation of MAPbI3 perovskite by the dual-functional 3-acetyl-2,5-dimethylthiophene (ADT) molecule are pre-sented. Density functional theory calculations show that both functional groups of ADT possessing different interaction energies could interact with PbI2. The carbonyl group in ADT shows the dominant interaction with Pb2+ forming an intermediate product that might decrease the crystallization rate. Further, the coordinate bonding between ADT and uncoordinated Pb2+ ions in perovskite leads to defect passivation. The 0.6% ADT-modified PSCs possess an average power conversion efficiency (PCE) of 18.22 +/- 0.80% and the highest PCE of 19.03%, whereas the pristine PSCs exhibit an average PCE of 16.23 +/- 1.32% and the highest PCE of 17.47%. Furthermore, the modified PSCs maintain 80% of the initial PCE up to 650 h during storage at ambient conditions (RH = 35 +/- 5%). The present study shows that the simultaneous crystalization control and defect passivation achieved via an ADT additive engineering approach could be an efficient strategy to enhance the PCE and stability of PSCs.

10a3-acetyl-210a5-dimethylthiophene10aadditive engineering10acrystallization control10adefect passivation10aPerovskite solar cells1 aSaykar, Nilesh, G.1 aIqbal, Muzahir1 aPawar, Mahendra1 aChavan, Kashinath, T.1 aMahapatra, Santosh, K. uhttps://library.ncl.res.in/content/dual-functional-3-acetyl-25-dimethylthiophene-additive-assisted-crystallization-control-and02388nas a2200301 4500008004100000022001400041245012100055210006900176260000800245300001600253490000700269520134900276653002001625653002001645653002901665653003601694653002701730653003201757100001901789700002201808700002401830700002601854700001901880700002601899700001901925700001601944856012601960 2023 eng d a1944-824400aChemical bridge-mediated heterojunction electron transport layers enable efficient and stable perovskite solar cells0 aChemical bridgemediated heterojunction electron transport layers cJUN a29597-296080 v153 a

Perovskite solar cells (PSCs) emerged as potential photovoltaicenergy-generating devices developing in recent years because of theirexcellent photovoltaic properties and ease of processing. However,PSCs are still reporting efficiencies much lower than their theoreticallimits owing to various losses caused by the charge transport layerand the perovskite. In this regard, herein, an interface engineeringstrategy using functional molecules and chemical bridges was appliedto reduce the loss of the heterojunction electron transport layer.As a functional interface layer, ethylenediaminetetraacetic acid (EDTA)was introduced between PCBM and the ZnO layer, and as a result, EDTAsimultaneously formed chemical bonds with PCBM and ZnO to serve asa chemical bridge connecting the two. DFT and chemical analyses revealedthat EDTA can act as a chemical bridge between PCBM and ZnO, passivatedefect sites, and improve charge transfer. Optoelectrical analysisproved that EDTA chemical bridge-mediated charge transfer (CBM-CT)provides more efficient interfacial charge transport by reducing trap-assistedrecombination losses at ETL interfaces, thereby improving device performance.The PSC with EDTA chemical bridge-mediated heterojunction ETL exhibiteda high PCE of 21.21%, almost no hysteresis, and excellent stabilityto both air and light.

10acharge transfer10achemical bridge10aelectron transport layer10aethylenediaminetetraacetic acid10aPerovskite solar cells10atrap-assisted recombination1 aPatil, Pramila1 aMaibam, Ashakiran1 aSangale, Sushil, S.1 aMann, Dilpreet, Singh1 aLee, Hyun-Jung1 aKrishnamurty, Sailaja1 aKwon, Sung-Nam1 aNa, Seok-In uhttps://library.ncl.res.in/content/chemical-bridge-mediated-heterojunction-electron-transport-layers-enable-efficient-and