本研究主要針對P3HT與PCBM混合的BHJ（bulk heterojunction）結構做外部量子效率（External Quantum Efficiency, EQE）量測抑或稱為光電轉換效率（Incident photons into electrons convert efficiency, IPCE）量測的校正與分析。有機高分子太陽能電池引用著空間電荷侷限電流理論（Space charge limited current，SCLC），而目前的IPCE系統是使用弱光源，因此無法獲得真實的每波長下的頻譜響應（Spectral Response,SR(λ))，為了獲得真實的頻譜響應，所以將IPCE量測系統外加一個光偏壓（Light bias）源，光偏壓光源目的為使得元件操作於一個太陽光下的環境下（100mW/cm2）。然而文獻中指出引用SCLC理論的元件系統在強光照射下，元件電流與光強不為線性輸出，呈現power law型式，如I=cPα，α是由照強光下所獲得的修正項因子。最後，將加光偏壓的IPCE量測數據透過修正項的校正，可獲得一個正確的頻譜響應。

In our research, we focus on the calibration of incident photons to electrons conversion efficiency （IPCE） of the bulk hetero-junction structure of polymer solar cells. The charge transport behavior of polymer solar cell under global AM1.5 (AM1.5G, 100mAcm-2) illumination is described by the space charge limited current (SCLC) theory. However, most IPCE measurement are carried under weak light intensity so we can not obtain the real spectral response per wavelength (SR(λ)) . In order to acquire the real SR, we add the light bias source in the IPCE system then the devices can be operated under the strong light intensity. Based on SCLC theory, the relation of photocurrent density and light intensity can be expressed as a power law equation which is I=cPα where α is correct factor when the devices is illuminated under strong light intensity. Finally, we correct the SR(λ) of IPCE system with light bias source by the correct factor, and we get the accurate SR.

參考文獻
1. 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).
2. D. E. Carlson and C. R. Wronski, “Amorphous silicon solar cell,” Appl. Phys. Lett. 28, 671 (1976).
3. M. A. Contreras, B. Egaas, K. Ramanathan, J. Hiltner, A. Swartzlander, F. Hason,
and R. Noufi, “Properties of 19.2% efficiency ZnO/CdS/CuInGaSe2 thin-film solar cells,” Prog. Photovolt.: Res. Appl. 7, 311 (1999).
4. B. O’Regan and M. A. Grätzel, “A low cost, high efficiency solar cell based on
dye-sensitized colloidal TiO2 films,” p Nature 353, 737 (1991).
5. http://en.wikipedia.org/wiki/Dye-sensitized_solar_cell
6. G. Yu, K. Pakbaz, and A. J. Heeger, “Semiconducting polymer diodes: Large size low cost photodetectors with excellent visible-ultraviolet sensitivity,” Appl. Phys. Lett. 64, 3422 (1994).
7. W. Ma, C. Yang, X. Gong, K. Lee, and A. J. Heeger, Adv. Funct. Mater. 15, 1617 (2005)
8. K. Kim, J. Liu, M. A. G. Namboothiry, and D. L. Carroll, “Role of donor and acceptor nanodomains in 6% efficient thermally annealed polymer photovoltaics” Appl. Phys. Lett. 90, 163511 (2007)
9. Hsiang-Yu Chen1,2, Jianhui Hou1*, Shaoqing Zhang1, Yongye Liang3,
Guanwen Yang2, Yang Yang2,Luping Yu3, YueWu1* and Gang Li,” Polymer
solar cells with enhanced open-circuit voltage and efficiency,”
10. K.M.Coakley and M.D.McGehee, “Conjugated polymer photovoltaic cells,” Chem. Mater.16, 4533 (2004)
11. Harald Hoppe, and Niyazi Serdar Sariciftci,“Organic solar cell: An review,”J.
Mater. Res., Vol. 19, No. 7, Jul 2004.
12. C. W. Tang, “Two-layer organic photovoltaic cell,” Appl. Phys. Lett. 48, 183
(1986)
13. A. K. Pandey and J. M. Nunzi, “Efficient flexible and thermally stable pentacene/C60 small molecule based organic solar cells,” App. Phys. Lett. 89,213506 (2006)
14. G. Li, V. Shrotriya, J. Huang, Y. Yao, T. Moriarty, K. Emery, and Y. Yang, Nat.
Mater. 4, 864 (2005).
15. Kyungkon Kim, Jiwen Liu, Manoj A. G. Namboothiry, and David L. Carroll,“Role of donor and acceptor nanodomains in 6% efficient thermally annealed polymer photovoltaic,” Appl. Phys. Lett. 90, 163511 (2007).
16. Vishal Shrotriya, Gang Li, Yan Yao, Tom Moriarty, Keith Emery,* and Yang Yang*, “Accurate Measurement and Characterization of Organic Solar Cell, ” Adv. Funct. Mater. 16, 2016(2006)
17. V.D. Mihailetchi, J. Wildeman, and P.W.M. Blom, “Space-Charge Limited Photocurrent,” Phys. Rev. Lett. 94, 126602 (2005)
18. R.N. Marks, J.J.M. Halls, D.D.C. Bradley, R. H. Friend, A. B. Holmes, J. Phys.:Condens. Matter. 6, 1379 (1994)
19. C. J. Brabec, A. Cravino, D. Meissner, N. S. Sariciftci, M.T. Rispens, L. Sanchez, J. C. Hummelen, and T Fromherz, “ The influence of materials work function on the open circuit voltage of plastic solar cells,” Thin Solid Film, 403-404,368 (2002).
20. 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, Proceedings of the SPIE, Vol. 5215, (SPIE, Bellingham, WA, 2004), p. 111.
21. C. J. Brabec, S. E. Shaheen, C. Winder, and N. S. Sariciftci, “Effect of LiF/metal electrodes on the performance of plastic solar cells,” Appl. Phys. Lett. 80, 1288 (2002)
22. website of wikipedia (http://en.wikipedia.org/wiki/Solar_radiation)
23. J. M. Halls, K. Pichler, R. H. Friend, S. C. Moratti, and A. B. Holmes, “Exciton
diffusion and dissociation in a poly(p-phenylenevinylene)/C60 heterojunction
photovoltaic cell,” Appl. Phys. Lett. 68, 3120 (1996)
24. Theander, A. Yartsev, D. Zigmantas, V. Sundström, W. Mammo, M. R.
Anderson, and O. Inganäs, “Photoluminescence quenching at a polythiophene/C60 heterojunction,” Phys. Rev. B, 61, 12957 (2000).
25. T. J. Savenije, J. M. Warman, and A.Goossens, “Visible light sensitisation of
titanium dioxide using a phenylene vinylene polymer,” Chem. Phys. Lett. 287, 148 (1998)
26. 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 heterostructures,” Phys. Rev. B, 59, 15346 (1999)
27. H. Shirakawa, E. J. Louis, A. G. MacDiarmid, C. K. Chiang, and A. J. Heeger,
“Synthesis of Electrically Conducting Organic Polymers: Halogen Derivatives of
Polyacetylene, (CH)x,” J. Chem. Soc., Chem. Commun. 578 (1977)
28. K. M. Coakley and M. D. McGehee, “Conjugated polymer photovoltaic cells,”
Chem. Mater. 16, 4533 (2004).
29. 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).
30. 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)
31. E. J. Meijer, D. M. de Leeuw, S. Setayesh, E. V. Veenendaal, B. H. Huisman, P. W. M. Blom, J. C. Hummelen, U. Scherf, T. M. Klapwijk. Nat. Mater. 2, 678 (2003)
32. H. Hoppe, and N. S. Sariciftci, “ Organic solar cells: An overview,” J. Mater. Res. 19, 1924 (2004)
33. N. F. Mott and D. Gurney. Electronic Processes in Ionic Crystals. Oxford,
New York, 1940.
34. J. Frenkel, “On pre-breakdown phenomena in insulators and electric semiconductors,” Phys. Rev. 54, 647 (1938).
35. D. M. Pai, “Transient photoconductivity in poly(N-vinylcarbazole),” J. Chem. Phys.52, 2285 (1970).
36. P. W. M. Blom, M. J. M. de Jong, and M. G. van Munster, “Electric-field and
temperature dependence of the hole mobility in poly(p-phenylene vinylene),” Phys. Rev. B 55, 656 (1997).
37. G. Li, C.-W. Chu, V. Shrotriya, J. Huang, Y. Yang,“Efficient inverted solar cells,” Appl. Phys. Lett. 88, 253503 (2006).
38. http://www.newport.com/images/webdocuments-en/images/12298.pdf
39. http://www.san-eielectric.co.jp/e/indu1.htm
40. http://sales.hamamatsu.com/assets/pdf/parts_S/S1337_series.pdf
41. Stanford Research Systems, Inc
42. V.D. Mihailetchi, J. Wildeman, and P.W.M. Blom, “Space-Charge Limited
Photocurrent,” Phys. Rev. Lett. 94, 126602 (2005)
43. Jong Bok Kim, Chang Su Kim, Youn Sang Kim, and Yueh-Lin Loo, “Oxidation of silver electrodes induces transition from conventional to inverted photovoltaic characteristics in polymer solar cells,” Appl. Phys. Lett. 95, 183301 (2009)