Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grants Nos. 11674405, and 11675280).

References

[1] Hung L. S., Chen C. H.. Mater. Sci. Eng.-R-Rep., 2002, 39: 143 CrossRef Google Scholar http://scholar.google.com/scholar_lookup?author=Hung L. S.&author=Chen C. H.&publication_year=2002&journal=Mater. Sci. Eng.-R-Rep.&volume=39&pages=143

[2] Brabec C. J., Sariciftci N. S., Hummelen J. C.. Adv. Funct. Mater., 2001, 11: 15 CrossRef Google Scholar http://scholar.google.com/scholar_lookup?author=Brabec C. J.&author=Sariciftci N. S.&author=Hummelen J. C.&publication_year=2001&journal=Adv. Funct. Mater.&volume=11&pages=15

[3] Bierwagen O.. Semicond. Sci. Technol., 2015, 30: 024001 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Bierwagen O.&publication_year=2015&journal=Semicond. Sci. Technol.&volume=30&pages=024001

[4] Babu S. H., Kaleemulla S., Rao N. M., Krishnamoorthi C.. J. Magn. Magn. Mater., 2016, 416: 66 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Babu S. H.&author=Kaleemulla S.&author=Rao N. M.&author=Krishnamoorthi C.&publication_year=2016&journal=J. Magn. Magn. Mater.&volume=416&pages=66

[5] Meng Y., Liu G., Liu A., Guo Z., Sun W., Shan F.. ACS Appl. Mater. Interfaces, 2017, 9: 10805 CrossRef Google Scholar http://scholar.google.com/scholar_lookup?author=Meng Y.&author=Liu G.&author=Liu A.&author=Guo Z.&author=Sun W.&author=Shan F.&publication_year=2017&journal=ACS Appl. Mater. Interfaces&volume=9&pages=10805

[6] Tanaka I., Mizuno M., Adachi H.. Phys. Rev. B, 1997, 56: 3536 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Tanaka I.&author=Mizuno M.&author=Adachi H.&publication_year=1997&journal=Phys. Rev. B&volume=56&pages=3536

[7] Tanaka I., Oba F., Tatsumi K., Kunisu M., Nakano M., Adachi H.. Mater. Trans., 2002, 43: 1426 CrossRef Google Scholar http://scholar.google.com/scholar_lookup?author=Tanaka I.&author=Oba F.&author=Tatsumi K.&author=Kunisu M.&author=Nakano M.&author=Adachi H.&publication_year=2002&journal=Mater. Trans.&volume=43&pages=1426

[8] ágoston P., Erhart P., Klein A., Albe K.. J. Phys.-Condens. Matter, 2009, 21: 455801 CrossRef PubMed ADS Google Scholar http://scholar.google.com/scholar_lookup?author=ágoston P.&author=Erhart P.&author=Klein A.&author=Albe K.&publication_year=2009&journal=J. Phys.-Condens. Matter&volume=21&pages=455801

[9] Bierwagen O., Speck J. S.. Appl. Phys. Lett., 2010, 97: 072103 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Bierwagen O.&author=Speck J. S.&publication_year=2010&journal=Appl. Phys. Lett.&volume=97&pages=072103

[10] Tomita T., Yamashita K., Hayafuji Y., Adachi H.. Appl. Phys. Lett., 2005, 87: 051911 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Tomita T.&author=Yamashita K.&author=Hayafuji Y.&author=Adachi H.&publication_year=2005&journal=Appl. Phys. Lett.&volume=87&pages=051911

[11] Lany S., Zakutayev A., Mason T. O., Wager J. F., Poeppelmeier K. R., Perkins J. D., Berry J. J., Ginley D. S., Zunger A.. Phys. Rev. Lett., 2012, 108: 016802 CrossRef PubMed ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Lany S.&author=Zakutayev A.&author=Mason T. O.&author=Wager J. F.&author=Poeppelmeier K. R.&author=Perkins J. D.&author=Berry J. J.&author=Ginley D. S.&author=Zunger A.&publication_year=2012&journal=Phys. Rev. Lett.&volume=108&pages=016802

[12] Zhang K. H. L., Egdell R. G., Offi F., Iacobucci S., Petaccia L., Gorovikov S., King P. D. C.. Phys. Rev. Lett., 2013, 110: 056803 CrossRef PubMed ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Zhang K. H. L.&author=Egdell R. G.&author=Offi F.&author=Iacobucci S.&author=Petaccia L.&author=Gorovikov S.&author=King P. D. C.&publication_year=2013&journal=Phys. Rev. Lett.&volume=110&pages=056803

[13] Veal B. W., Kim S. K., Zapol P., Iddir H., Baldo P. M., Eastman J. A.. Nat. Commun., 2016, 7: 11892 CrossRef PubMed ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Veal B. W.&author=Kim S. K.&author=Zapol P.&author=Iddir H.&author=Baldo P. M.&author=Eastman J. A.&publication_year=2016&journal=Nat. Commun.&volume=7&pages=11892

[14] Gan J., Lu X., Wu J., Xie S., Zhai T., Yu M., Zhang Z., Mao Y., Wang S. C. I., Shen Y., Tong Y.. Sci. Rep., 2013, 3: 1021 CrossRef PubMed ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Gan J.&author=Lu X.&author=Wu J.&author=Xie S.&author=Zhai T.&author=Yu M.&author=Zhang Z.&author=Mao Y.&author=Wang S. C. I.&author=Shen Y.&author=Tong Y.&publication_year=2013&journal=Sci. Rep.&volume=3&pages=1021

[15] Lei F., Sun Y., Liu K., Gao S., Liang L., Pan B., Xie Y.. J. Am. Chem. Soc., 2014, 136: 6826 CrossRef PubMed Google Scholar http://scholar.google.com/scholar_lookup?author=Lei F.&author=Sun Y.&author=Liu K.&author=Gao S.&author=Liang L.&author=Pan B.&author=Xie Y.&publication_year=2014&journal=J. Am. Chem. Soc.&volume=136&pages=6826

[16] Liu L., Mei Z., Tang A., Azarov A., Kuznetsov A., Xue Q. K., Du X.. Phys. Rev. B, 2016, 93: 235305 CrossRef ADS arXiv Google Scholar http://scholar.google.com/scholar_lookup?author=Liu L.&author=Mei Z.&author=Tang A.&author=Azarov A.&author=Kuznetsov A.&author=Xue Q. K.&author=Du X.&publication_year=2016&journal=Phys. Rev. B&volume=93&pages=235305

[17] Azarov A., Venkatachalapathy V., Mei Z., Liu L., Du X., Galeckas A., Monakhov E., Svensson B. G., Kuznetsov A.. Phys. Rev. B, 2016, 94: 195208 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Azarov A.&author=Venkatachalapathy V.&author=Mei Z.&author=Liu L.&author=Du X.&author=Galeckas A.&author=Monakhov E.&author=Svensson B. G.&author=Kuznetsov A.&publication_year=2016&journal=Phys. Rev. B&volume=94&pages=195208

[18] Mei Z. X., Wang Y., Du X. L., Zeng Z. Q., Ying M. J., Zheng H., Jia J. F., Xue Q. K., Zhang Z.. J. Cryst. Growth, 2006, 289: 686 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Mei Z. X.&author=Wang Y.&author=Du X. L.&author=Zeng Z. Q.&author=Ying M. J.&author=Zheng H.&author=Jia J. F.&author=Xue Q. K.&author=Zhang Z.&publication_year=2006&journal=J. Cryst. Growth&volume=289&pages=686

[19] Vidya R., Ravindran P., Fjellv?g H., Svensson B. G., Monakhov E., Ganchenkova M., Nieminen R. M.. Phys. Rev. B, 2011, 83: 045206 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Vidya R.&author=Ravindran P.&author=Fjellv?g H.&author=Svensson B. G.&author=Monakhov E.&author=Ganchenkova M.&author=Nieminen R. M.&publication_year=2011&journal=Phys. Rev. B&volume=83&pages=045206

[20] ágoston P., Albe K.. Phys. Rev. B, 2010, 81: 195205 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=ágoston P.&author=Albe K.&publication_year=2010&journal=Phys. Rev. B&volume=81&pages=195205

[21] Wirtz G. P., Takiar H. P.. J. Am. Ceramic Soc., 1981, 64: 748 CrossRef Google Scholar http://scholar.google.com/scholar_lookup?author=Wirtz G. P.&author=Takiar H. P.&publication_year=1981&journal=J. Am. Ceramic Soc.&volume=64&pages=748