在本論文裡將一些構想導入有機太陽能電池中:一、壓印無機奈米材料入有機材料層，使其形成反應層一部分，如此可吸收不同波段之光能，亦可作為載子傳導路徑；二、壓印奈米結構使施體與授體材料間接觸面積的增加，進而產生更多的激子分離區提升Jsc；三、雙層串聯結構，藉由材料的不同光吸收波段，促使元件將不同波段的光源吸收轉換成電能等，期望能藉此這些改變來提升光電轉換效率。
實驗主要以有機太陽能電池的P3HT 及PCBM 為材料，再壓印入其他無機材料或奈米結構，如：矽奈米線(Si nano-wires)、ZnSe、CdS奈米材料等。研究內容可分成下列幾個部分：一、P3HT+TiO2，利用P3HT 與自製的TiO2 sol-gel 製備反應層，效率不高，光電轉效率為0.11%。二、P3HT+矽奈米線，在P3HT 薄膜上將矽奈米線壓入，不過因掉落數量限制，提升之效率有限。三、P3HT+PCBM+各種材料奈米線，又可分為三個系列：1.P3HT+PCBM 之元件最佳化，效率可達3.666%。2.不同直徑的矽奈米線成長於ITO 基板上，其上覆蓋P3HT+PCBM 薄膜，搭配不同金屬電極（金或鋁)，其結果以金電極效果較佳，光電轉換效率可達0.138%，而奈米線直徑越大，光電流密度反而降低。3.在P3HT+PCBM 薄膜上將矽奈米線、ZnSe 及CdS 奈米材料壓入其中，光電轉換效率分別為2.247%、2.632%與3.184%，主要影響因素為奈米材料的掉落難易度與數量。四、雙層串聯結構，於矽太陽能電池上旋塗有機高分子材料製成串聯元件，不過因有機太陽能電池無法順利運作，以致電壓無法疊加，效率無法有效提升，仍有待努力。

In this thesis , we make some changes in the organic solar cell：First , we try to imprint some inorganic nano-materials into the active-layer . It helps organic solar cell to absorb the light of different wavelength and the nano-materials may improve the transmission . Second , the nanostructures increase the contact area and it may produce more Jsc . Third , to use two kinds of solar cells to produce the tandem solar cell . It can absorbe the light of different wavelength , increase the Voc and improve the power conversion efficiency .
We imprint some inorganic nano-materials into the active-layer of organic solar cell . For example：silicon nano-wires , ZnSe nano-materials and CdS nano-materials . There are several parts of my researches：1. P3HT+TiO2 , we use P3HT and the sol-gel of TiO2 to make the device , but the power conversion efficiency is not high , 0.11% . 2. P3HT+silicon nano-wires , to nano-imprint the silicon nano-wires into P3HT thin film , but it’s not enough to improve the power conversion efficiency . 3. P3HT+PCBM+nano-materials：(1) To use P3HT and PCBM to make device . After we optimize the process , the power conversion efficiency IV is improved successfully , 3.666% . (2) To grow the silicon nano-wires with different diameters on the ITO film , and then we use the blended solution (P3HT+PCBM) to spin on it . The P3HT+PCBM thin film covers the silicon nano-wires . Finally , to thermal evaporate electrode by Al or Au . The Au electrode has good effect and the power conversion efficiency is 0.138% . In addition , when the diameter increases , silicon nano-wires may effect the transmission and the Jsc reduces . (3) To Imprint silicon nano-wires , ZnSe or CdS nano-materials into the P3HT+PCBM thin film and the power conversion efficiency is 2.247% , 2.632% and 3.184% , respectively . It’s important to let nano-materials be imprint into the active-layer . The number of the nano-materials in the active-layer effects the result . 4. Tandem solar cell , we try to produce the tandem solar cell by using silicon and polymer , but the organic solar cell doesn’t work and Voc doesn’t increase .

[ 1] R. A. Kerr , "Climate change - Scientists tell policymakers we're all warming the world" Science , 315 , 754 (2007)
[ 2] D. M. Chapin , C. S. Fuller , and G. L. Pearson , "A New Silicon pn Junction Photocell for Converting Solar Radiation into Electrical Power" J. Appl. Phys. 25 , 676 (1954)
[ 3] J. Zhao , A. Wang , and M. A. Green , "24.5% efficiency silicon PERT cells on MCZ substrates and 24.7% efficiency PERL cells on FZ substrates" Prog. Photovolt. : Res. App. 7 , 471 (1999)
[ 4] M. A. Green , K. Emery , Y. Hishikawa and W. Warta "Solar Cell Efficiency Tables (Version 33)" Prog. Photovolt.：Res. Appl. 17 , 85 (2009)
[ 5] D. E. Carlson and C. R. Wronski , "Amorphous silicon solar cell" Appl. Phys. Lett. 28 , 671 (1976)
[ 6] C. J. Brabec , N. S. Sariciftci and J. C. Hummelen "Plastic Solar Cell" Adv. Funct. Mater. 11 , 15 (2001)
[ 7] F. C. Krebs , J. Alstrup , H. Spanggaard , K. Larsen and E. Kold "Production of large-area polymer solar cells by industrial silk screen printing , lifetime considerations and lamination with polythyleneterephthalate" Solar energy materials and solar cells 83 , 293 (2004)
[ 8] K. Sriprapa and P. Sichanugrist "High efficiency amorphous/microcrystalline silicon solar cell fabricated on metal substrate" Photovoltaic Energy Conversion 2003. Proceedings of 3rd World Conference on Volume 3 , 2799 (2003)
[ 9] M. A. Contreras , B. Egaas , K. Ramanathan , J. Hiltner , A. Swartzlander , F. Hason and R. Noufi "Properties of 19.2% efficiency ZnO/CdS/Ce2 thin-film solar cells" Prog. Photovolt.： Res. Appl. 7 , 311 (1999)
[10] C. W. Tang , "Two-layer organic photovoltaic cell" Appl. Phys. Lett. 48 , 183 (1986)
[11] P. Peuman , A. Yakimov , S. R. Forrest "Small molecular weight organic thin-film photodetectors and solar cells" J. Appl. Phys. 93 , 3693 (2003)
[12] B. O'Regan and M. A. Grätzel "A low cost , high efficiency solar cell based on dye-sensitized colloidal TiO2 films" Nature 353 , 737 (1991)
[13] C. H. Lee , G. Yu , D. Moses , K. Pakbaz , C. Zhang , N. S. Sariciftci , A. J. Heeger and F. Wudl "Sensitization of the photoconductivity of conducting polymers by C60: Photoinduced electron transfer" Phys. Rev. B 48 , 15425 (1993)
[14] G. Yu , K. Pakbaz and A. J. Heeger "Semiconducting polymer diodes：Large size low cost photodetectors with excellent visible-ultraciolet sensitivity" Appl. Phys. Lett. 64 , 3422 (1994)
[15] K. Kim , J. Liu , M. A. Namboothiry and D. L. Carroll "Role of donor and acceptor nanodomains in 6% efficient thermally annealed polymer photocoltaic" Appl. Phys. Lett. 90 , 163511 (2007)
[16] B. A. Gregg and M. C. Hanna "Comparing organic to inorganic photovoltaic cells - Theory , experiment and simulation" J. Appl. Phys. 93 , 3605 (2003)
[17] C. Y. Yamg and A. J. Heeger "Morphology of composites of semiconducting polymers mixed with C60" Synthetic Metals. 83 , 85 (1996)
[18] K. M. Coakley and M. D. McGehee "Conjugated Polymer Photovoltaic Cells" Chem. Mater. 16 , 4535 (2004)
[19] W. U. Huynh , J. J. Dittmer , N.Teclemariam , D. Milliron , A. P. Alivisatos and K. W. J. Barnham "Charge Transport in Hybrid Nanorod-polymer Composite Photovoltaic Cells" Phys. Rev. B 67 , 115326 (2003)
[20] T. Kietzke "Recent Advances in Organic Solar cells" Adv. in OptoElectronics 2007 , 40285 (2007)
[21] S. R. Forrest "The Limits to Organic Photovoltaic Cell Efficiency " Mrs. Bull. 30 , 28 (2005)
[22] A. Haugeneder , M. Neges , C. Kallinger , W. Spirkl , U. Lemmer , J. Feldman , U. Scherf , E. Harth , A. Gügel and K. Müllen "Exciton diffusion and dissociation in conjugated polymer/fullerene blends and heterstructures" Phys. Rev. B 59 , 15346 (1999)
[23] H. Shirakawa , E. J. Louis , A. G. MacDiarmid , C. K. Chiang and A. J. Heeger "Synthesis of Electrically Conducting Organic Polymer : Halogen Derivatives of Polyacetylene , (CH)x" J. Chem. Soc. , Chem. Commun. 578 (1977)
[24] I. G. Hill , A. Rajagopal , A. Kahn and Y. Hu "Molecular level alignment at organic semiconductor-metal interfaces" Appl. Phys. Lett. 73 , 662 (1998)
[25] H. Ishii , K. Sugiyama , E. Ito and K. Seki "Energy Level Alignment and Interfacial Electronic Structure at Organic/Metal and Organic/Organic Interfaces" Adv. Mater. 11 , 605 (1999)
[26] I. G. Hill , A. J. Makinen and Z. H. Kafafi "Initial stages of metal/organi semicoductor interface formation" J. Appl. Phy. 88 , 889 (2000)
[27] S. Karg , M. Meier and W. Riess "Light-emitting diodes based on poly-p-phenylene-vinylene : I. Charge-carrier injection and transport" J. Appl. Phys. 82 , 1951 (1997)
[28] R. H. Fowler and L. Nordheim "Electron emission in intense electric fields" Proc. R. Soc. London Ser. A 119 , 173 (1928)
[29] S. Y. Chou , P. R. Krauss , P. J. Renstrom "Imprint of sub-25 nm Vias and Trenches in Polymers" Appl. Phys. Lett. 67 , No. 20 , 3114 (1995)
[30] R. N. Marks , J. J. M. Halls , D. D. C. Bradley , R. H. Friend and A. B. Holmes "The photovoltaic response in poly(p-phenylene vinylene) thin-film devices" J. Phys : Condensed Matter 6 , 1379 (1994)
[31] C. J. Brabec , A. Cravino , D. Meissner , N. S. Sariciftci , M. T. Rispens , L. Sanchez , J. C. Hummelen and T. Fromberz "The influence of materials work function on the open circuit voltage of plastic solar cells" Thin Solid Film 403-404 , 368 (2002)
[32] H. Kim , S-H. Jin H. Suh and K. Lee "Origin of the open circuit voltage in conjugated polymer-fullerene photovoltaic cells" In Organic Photovoltaics IV , edited by Z. H. Kafafi and P. A. Lane , Proceeding of the SPIE 5215 , 111 (2004)
[33] H. Hoppe and N. S. Sariciftci "Organic solar cells : An overview" J. Mater. Res. 19 , 1924 (2004)
[34] H. Sirringhaus , P. J. Brown , R. H. Friend , M. M. Nielsen , K. Bechgaard , B. M. W. Langeveld-Voss , A. J. H. Spiering , R. A. J. Janssen , E. W. Meijer , P. Herwig and D. M. de Leeuw "Two-dimensional charge transport in self-organized , high-mobility conjugated polymers" Nature 401 , 685 (1999)
[35] J. C. Hummelen , B. W. Knight , F. Lepeq , F. Wudl , J. Yao and C. L. Wilkins "Preparation and Characterization of Fulleroid and Methanofullerene Derivatives" J. Org.
Chem. 60 , 532 (1995)
[36] E. J. Meijer , D. M. de Leeuw , S. Setayesh , E. V. Veenendaal , B. H. Huisman , P. W. M. Blom , J. C. Hummelen , U. Scherf and T. M. Klapwijk "Solution-processed ambipolar organic field-effect transistors and inverters" Nat. Mater. 2 , 678 (2003)
[37] S. Z. Chu , K. Wada , S. Inoue , and S. I. Todoroki , “Synthesis and Characterization of Titania Nanostructures on Glass by Al Anodization and Sol-Gel Process” Chem. Mater. 14 , 266 (2002)
[38] M. G. Mason , L. S. Hung , C. W. Tang , S. T. Lee , K. W. Wong and M. Wang "Characterization of treated ingium-tin-oxide surface used electroluminescent devices" J. Appl.
Phys. 86 , 1688 (1999)
[39] Gang Li , V. Shrotriya , J. Huang , Y. Yao , T. Moriarty , K. Emery and Y. Yang "High-efficiency solution processable polymer photovoltaic cells by self-organization of polymer blends" Natere materials 4 , 864 (2005)
[40] Y. Kim , S. A. Choulis , J. Nelson , D. D. C. Bradley , S. Cook and J. R. Durrant "Device annealing effect in organic solar cells with blends of regioregular poly(3-hexylthiophene) and soluble fullerene" Appl. Phys. Lett. 86 , 063502 (2005)
[41] V. Shrotriya , G. Li , Y. Yao , T. Moriarty , K. Emery and Y. Yang "Accurate measurement and characterization of organic solar cells" Adv. Funct. Mater. 16 , 2016 (2006)
[42] G. E. Thompson "Porous anodic alumina : fabrication , characterization and applications" Thin solid films 297 , 192 (1997)
[43] A. P. Li , F. Muller , A. Birner , K. Nielsch and U. Gösele "Haxagonal pore arrays with 50-420 nm interpore distance formed by self-organization in anodic alumina" J. Appl. Phys. 84 , 2063 (1998)
[44] C. C. Weng , C. P. Chen , C. H. Ting and K. H. Wei "Using a Solution Crystal Growth Method To Grow Arrays of Aligned, Individually Distinct, Single-Crystalline TiO2
Nanoneedles within Nanocavities" Chem. Mater. 17 , 3328 (2005)
[45] C. Y. Kuo , W. C. Tang , C. Gau , T. F. Guo and D. Z. Jeng "Ordered bulk heterojunction solar cells with vertically aligned TiO2 nanorods embedded in a conjugated polymer" Appl. Phys. Lett. 93 , 033307 (2008)
[46] F. Padinger , R. S. Rittberger and N. S. Sariciftci "Effects of Postproduction Treatment on Plastic Splar Cells" Adv. Fun. Mat. 13 , 85 (2003)
[47] W. Ma , C. Yang , X. Gong , K. Lee and A. J. Heeger "Thermally Stable , Efficient Polrmer Solar Cells with Nanoscale Control of the Interpenetrating Network Morphology" Adv. Fun. Mat. 15 , 1617 (2005)
[48] K. M. Coakley , M. D. McGehee "Photovoltaic cells made from conjugated polymers infiltrated into mesoporous titania" Appl. Phys. Lett. 83 , 3380 (2003)
[49] W. U. Huynh , J. J. Dittmer and A. P. Alivisatos "Hybrid Nanorod-Polymer Solar Cells " Science 295 , 2425 (2002)
[50] Y. Kang , N. G. Park and D. Kim "Hybrid solar cells with vertically aligned CdTe nanorods and a conjugated polymer" Appl. Phys. Lett. 86 , 1131101 (2005)
[51] E. Kymakis and G. A. J. Amaratunga "Single-wall carbon nanotube/conjugated polymer photovoltaic devices" Appl. Phys. Lett. 80, 112 (2002)
[52] C. J. Brabec , S. E. Shaheen , C. Winder , N. S. Sariciftci "Effect of LiF/metal electrodes on the performance of plastic solar cells" Appl. phys. lett. 80 , 1288 (2002)
[53] M. Hiramoto , M. Suezaki , M. Yokoyama " Effect of Thin Gold Interstitial-layer on the Photovoltaic Properties of Tandem Organic Solar Cell " Chem. Lett. 19 , 327 (1990)
[54] G. Dennler , H. J. Prall , R. Koeppe , M. Egginger , R. Autengruber and N. S. Saricifti "Enhanced spectral coverage in tandem organic solar cells" Appl. Phys. Lett. 89 , 073502 (2006)
[55] J. Y. Kim , K. Lee , N. E. Coates , D. Moses , T. Q. Nguyen , M. Dante and A. J. Heeger "Efficient Tandem Polymer Solar Cells Fabricated by All-Solution Processing" Science 317 , 222 (2007)
[56] D. Chirvase , J. Parisi , J. C. Hummelen and V. Dyakonov "Influence of nanomorphology on the photovoltaic action of polymer-fullerene composites" Nanotechnology 15 , 1317 (2004)
[57] C. J. Brabec and F. Pandingger "Realization of Large Area Flexible Fullerene-Conjugate Polymer Photocells : A Route to Plastic Solar cell" Synthetic Metals 102 , 861 (1999)
[58] M. Al-Ibrahim , H. K. Roth and S. Sensfuss "Efficient large-area polymer solar cells on flexible substrates" Appl. Phys. Lett. 85 , 1481 (2004)
[59] G. Kalita , S. Adhikari , H. R. Aryal , M. Umeno , R. Afre , T. Soga and M. Sharon "Cutting carbon nanotubes for solar cell application" Appl. Phys. Lett. 92 , 123508 (2008)
[60] A. J. Miller , R. A. Hatton , G. Y. Chen and S. R. P. Silva "Carbon nanotubes grown on In2O3：Sn glass as large area electrodes for organic photovoltaics" Appl. Phys. Lett. 90 , 023105 (2007)
[61] B. Y. Yu , A. Tsai , S. P. Tsai , K. T. Wong , Y. Yang , C. W. Chu and J. J. Shyue "Efficient inverted solar cells using TiO2 nanotube arrays " Nanotechnology 19 , 255202 (2008)
[62] Z. X. Su , J. Sha , J. J. Niu , J. X. Liu and D. R. Yang "Synthesis and Raman spectra of Si-nanowires" Phys. Stat. Sol. 203 , 792 (2006)
[63] C. Y. Kuo and C. Gau "Arrangement of band structure for organic-inorganic photovoltaics embedded with silicon nanowire arrays grown on indium tin oxide glass" Appl. Phys. Lett. 95 ,053302 (2009)
[64] K. Lee , J. Y. Kim , S. H. Park , S. H. Kim , S. Cho and A. J. Heeger "Air-stable Polymer Electronic Devices" Adv. Mater. 19 , 2445 (2007)
[65] J. Y. Kim , S. H. Kim , H.-H. Lee , K. Lee , W. Ma ,X. Gong and A. J. Heeger "New Architecture for High-Efficiency Polymer Photovoltaic Cells Using Solution-Based Titanium
Oxide as an Optical Spacer" Adv. Mater. 18 , 572 (2006)
[66] V. Shrotriya , E. H-E Wu , G. Li , Y. Yao and Y. Yang "Efficient light harvesting in multiple-device stacked structure for polymer solar cells" Appl. Phys. Lett. 88 , 064104 (2006)
[67] K. Kawano , N. Ito , T. Nishimori and J. Sakai " Open circuit voltage of stacked bulk heterojunction organic solar cells" Appl. Phys. Lett. 88 , 073514 (2006)