1. We report, a simplified method for passivation of emitter surface of polycrystalline silicon solar cells at room temperature. The Olelyamine is used as passivation agent. Passivation coating is applied successfully via spin coating method at room temperature. Due to this coating it is seen that the efficiency of solar cell is increased. However, the process is not stable in terms of efficiency, at primary stage after applying immediate coating the efficiency increased by 7% and after 40 hrs. it becomes 16%.The slow efficiency reduction was observed over time due to interaction of Olelyamine and CO 2.Humidity is also manifests this degradation. INTRODUCTION POLYCRYSTALLINE SILICON SOLAR CELL PASSIVATION AT ROOM TEMPERATURE Onkar S Shinde 1,2, Subhash V Ghaisas 2 and Neelkanth G Dhere 1 1 Florida Solar Energy Center, University of Central Florida,1679 Clearlake Road, Cocoa, FL 32922-5703, USA 2 School of Energy Studies, SP Pune University, Pune-411007, India. RESULTS a) c) b) d) a) Figure-2: SEM and EDAX of emitter surface of bare silicon solar cell in figure a and b without ARC. SEM and EDAX of Olelyamine coated emitter surface of silicon solar cell in figure c and d CH 3 + or NH 2 + or H + SiP P N H H H H CH 3 + or NH 2 + or H + HH H H n-type emitter of a solar cell Dangling Bonds Passivated Bonds Olelyamine(C 18 H 35 NH 2 ) PASSIVATION MECHANISM In above figure 1,method of Olelyamine (C 18 H 35 NH 2 ) coating on the solar cell n type emitter surface is demonstrated. It is shown that the phosphorous is also playing the role in passivation (refer FTIR Analysis) and the surface of Silicon is totally distinct characteristics than n-type wafer. This is due to shallow junction present in the si solar cell devices. The passivation layer and its contribution to the increment in power conversion efficiency is discussed in this article. It is a conventional p-n junction solar cell with p-type base and highly doped n emitter with passivation coating SiN x is on top. This passivation layer and native oxide removed from emitter surface with standard cleaning process. Further,sample subjected to EDAX for chemical analysis which demonstrates no molecules from SiN x remained on surface of the solar cell which shown in figure 2a and 2b. Then on the same sample Oleyamine is deposited at room temperature and related SEM and EDAX is shown in Figure 2c and 2d. Figure-1: Passivation Mechanism SEM And EDAX Analysis FTIR Analysis and QSSP minority carrier lifetime Sample Recombination lifetime(µs) HF- Untreated HF- Treated Olelyamine Coated n - Emitter of solar cell 12.4913.5514.15 n-type Silicon Wafer 4.545.264.6 Sample Isc (mA) Voc (V) ɳ (%) % Increment in Efficiency Bare Solar cell 18.340.54113.34- Solar cell With Olelyamine Coated 20.50.54915.2013.94 Current –Voltage characteristics Figure-3:FTIR of emitter surface of Pure Olelyamine(red), coated silicon solar cell(black and blue) and n type wafer Olelyamine coated (green).. Table1-Minority lifetime measurement of with and without Olelyamine coating Figure-4:I-V characteristics of Bare Silicon Solar cell and Olelyamine coated silicon solar cell. Table 2- Summary of Current –voltage parameters of Silicon Solar cell Acknowledgement Authors are thankful to MNRE, Government of India and Solar Energy Research Institute for India and the United States. (SERIIUS) funded jointly by the U.S. Department of Energy subcontract DE AC36-08G028308 (Office of Science, Office of Basic Energy Sciences, and Energy Efficiency and Renewable Energy, Solar Energy Technology Program, with support from the Office of International Affairs) and the Government of India subcontract IUSSTF/JCERDC-SERIIUS/2012 dated 22nd Nov. 2012.