Cover letter Manuscript number: BXXXXXK MS Type: Article Title: "XXXX" Correspondence Author: XXX Dear Dr. Fay Riordan: Thank you very much for your attention and the referee’s evaluation and comments on our paper BXXXXK. We have revised the manuscript according to your kind advices and referee’s detailed suggestions. Enclosed please find the responses to the referees. We sincerely hope this manuscript will be finally acceptable to be published on XXX. Thank you very much for all your help and looking forward to hearing from you soon. Best regards Sincerely yours Dr. XXX Please find the following Response to the comments of referees: Response to the referee’s comments Referee A Comment 1: The titania material formed after calcining at 450 oC is not characterized. XRD of these calcined materials should be provided to understand the crystallinity and phase. Response: Thanks for the referee’s kind suggestion. According to his/her advices, X-ray diffractometry spectroscopy (XRD) of the calcined TiO2 film was given in Supporting Information (Figure S1) in this revised version. It illustrated that the hydrothermal synthesized TiO2 materials after calcining at 450 oC is entire anatase, which was confirmed by the X-ray diffractometer with Cu Kα radiation (Rigaku D/ max-2500). Comment 2: The authors must state the mechanical strength of these materials after the removal of PS by calcinations. Response: Thanks for the referee’s suggestion. By a scotch tape peel test, the TiO2 film can’t be stripped from the conducting glass substrate, which indicates that the mechanical strength of as-prepared composite film is strong enough for the fabrication of solar cell devices. The revised details can be found in Line 165-168, page 2. Referee B Comment 1: The microtube structure with the size of 500-800 nm cannot only scatter the visible light in the region of 500-800 nm, but also can scatter more efficiently the visible light in the region below 500 nm, and can scatter near infrared light. This point should be clarified in the main text. Response: Thanks for the referee’s kind advice. Just like what the referee said, the microtube network structure can scatter not only visible light but also near infrared light. We added this point in revised manuscript and the detailed revision can be found in Line 194-205, Page 2-3. Comment 2: They described the simulated sunlight as "one-simulating-sunlight condition (AM1.5, 100 mW cm-2)". But in my opinion, it would be better to use the phrase like "AM 1.5 simulated solar light (100 mW cm-2)". Response: Thanks for the referee’s suggestion. "one-simulating-sunlight condition (AM1.5, 100 mW cm-2)" has been changed to "AM 1.5 simulated solar light (100 mW cm-2)" in our revised manuscript. (Line 217, Page 3) Comment 3: They correctly pointed out that the increased ratio of solar energy conversion efficiency by the microtube-network structure was smaller than that estimated from the absorption spectra. It is understandable, considering that a TiO2 porous film was filled with solvent in a device, while that for spectroscopic measurements is filled with air. Response: Thanks for the referee’s good evaluation and kind suggestion. The referee’s explanation is very correct. Light absorptions of TiO2 photoelectrodes are different when they are filled with electrolytes and air, respectively. It is ascribed to that a part of solar light will be absorbed by the electrolytes and also different medium in the porous film will induce the different refractive indices. This is one reason that increased ratio of conversion efficiency by the microtube-network structure was smaller than that estimated from the absorption spectra. We added this point into our revised manuscript and the details can be found in Line 325-330, Page 4. | 
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