PERFORMANCE LIMITING FACTORS IN FLEXIBLE DYE SOLAR CELLS
Doctoral Dissertation (2009)
Èñòî÷íèê: http://lib.tkk.fi/Diss/2009/isbn9789512299010/isbn9789512299010.pdf
Àâòîð: Janne Halme
| QUOTE | Table of contents
Preface...........................................................1
List of Publications...................................................5
Abbreviations and symbols ..............................6
1. Introduction............................................................9
1.1. Background and motivation ........... 9
1.2. Objectives and scope.......................... 10
1.3. Outline of the thesis.............................. 12
2. The dye solar cell .................................................14
2.1. Principle of photovoltaic energy conversion................ 14
2.2. Operating principle of the dye solar cell ....... 15
3. Photovoltaic function of dye solar cells..............18
3.1. Short circuit current density ............. 19
3.1.1. Light harvesting efficiency.... 20
3.1.2. Electron injection efficiency .. 22
3.1.3. Electron collection efficiency................ 23
3.2. Open circuit voltage .................. 25
3.3. Fill factor .......................................... 27
4. Performance characterization of dye solar cells ...............29
4.1. Photovoltaic characterization ............................. 30
4.2. Optical characterization ................ 31
4.3. Electrochemical impedance spectroscopy........ 33
4.4. Analysis of the IV curve based on impedance .......39
4.5. Intensity modulated photocurrent and photovolt age spectroscopy ... 40
4.6. Relation between IMPS, IMVS and EIS ... 44
5. Results and Discussion ...........45
5.1. Spray deposition and compression of nanoparticle electrodes on ITOPET plastic substrates (Publication I) ................. 45
5.2. Impedance spectroscopy of pressed counter electrodes on ITOPET plastic substrates (Publication II) ......... 47
5.3. Electrochemical characterization of stainless steel based dye solar cells (Publication III) .............. 49
5.4. Substrate mediated recombination and contact resistance in pressed TiO2 photoelectrodes on ITOPET plastic (Publication IV) ............ 50
5.5. Quantitative estimation of the light harvesting, electron injection and charge collection efficiencies by optical and IPCE measure ments (Publication V) .......... 51
5.6. Photocurrent limiting factors of pressed TiO2 dye solar cells (Publication V)..... 54
5.7. Effect of nonuniform light absorption and inefficient electron collection on the
IMPS and IMVS response (Publication VI) ... 55
5.8. IMPSratio (Publication VI)........... 58
5.9. Comparison of electron diffusion length determined by different techniques...... 59
6. Summary and Conclusions ..........60
I. Appendix: Time-dependent standard diffusion model
and its solution .............63
References .....................68
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