{"id":3808,"date":"2024-01-08T11:16:01","date_gmt":"2024-01-08T02:16:01","guid":{"rendered":"http:\/\/tuat-chemphys.net\/?p=3808"},"modified":"2024-07-21T12:15:30","modified_gmt":"2024-07-21T03:15:30","slug":"a-simple-low-cost-method-to-improve-solar-cell-performance-by-water-treatment-%e6%b0%b4%e5%87%a6%e7%90%86%e3%81%ab%e3%82%88%e3%82%8b%e5%a4%aa%e9%99%bd%e9%9b%bb%e6%b1%a0%e6%80%a7%e8%83%bd","status":"publish","type":"post","link":"https:\/\/tuat-chemphys.net\/?p=3808","title":{"rendered":"A low-cost method to improve solar cell performance by water treatment. \u6c34\u51e6\u7406\u306b\u3088\u308b\u592a\u967d\u96fb\u6c60\u6027\u80fd\u5411\u4e0a\u306e\u4f4e\u30b3\u30b9\u30c8\u306a\u65b9\u6cd5"},"content":{"rendered":"\n

Dr. M. Hasumi and Dr. T. Sameshima from our department have developed a novel method to improve the performance of crystalline silicon (for solar cells) by passivating the cut edges with heat treatment in liquid water.\u00a0\u6771\u4eac\u8fb2\u5de5\u5927\u5b66\uff08\u5316\u5b66\u7269\u7406\u5de5\u5b66\u79d1\uff09\u306e\u9bab\u5cf6\u535a\u58eb\u3068\u84ee\u898b\u535a\u58eb\u3089\u306e\u30b0\u30eb\u30fc\u30d7\u306f\u3001\u6c34\u4e2d\u3067\u306e\u71b1\u51e6\u7406\u306b\u3088\u308a\u7d50\u6676\u30b7\u30ea\u30b3\u30f3\uff08\u592a\u967d\u96fb\u6c60\u7528\uff09\u306e\u5207\u65ad\u9762\u3068\u8868\u9762\u306b\u8584\u3044\u9178\u5316\u7269\u5c64\u3092\u5f62\u6210\u3059\u308b\u3053\u3068\u3067\u3001\u592a\u967d\u96fb\u6c60\u306e\u54c1\u8cea\u3092\u5411\u4e0a\u3055\u305b\u308b\u65b0\u3057\u3044\u65b9\u6cd5\u3092\u958b\u767a\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u6210\u679c\u306f\u3001\u5fdc\u7528\u7269\u7406\u5b66\u4f1a\u8a8c\u306b\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n\n\n

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Schematic image of heat treatment in liquid water at 90 \u00b0C.<\/figcaption><\/figure>\n<\/div>\n\n\n

They have developed a method to improve the quality of n-type crystalline silicon wafers by coating the cut edges with thin oxide layers. They achieved this by heating the wafers in water for a short time and then in air for a longer time. The mechanical cutting process reduced the quality of the wafers, which affected how well they could convert light into electricity. Their method improved the quality of the wafers, especially near the cut edges. They used a simple model to analyze the results. They found that our method reduced the loss of electric charge at the cut edges, while increasing it slightly at the surface, likely because of the electric field effect. The passivation layer was stable for a long time. \u7d50\u6676\u30b7\u30ea\u30b3\u30f3\u592a\u967d\u96fb\u6c60\u306f\u3001\u592a\u967d\u5149\u3092\u96fb\u6c17\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u5e83\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u5207\u65ad\u9762\u3067\u306e\u96fb\u8377\u306e\u640d\u5931\u304c\u9ad8\u304f\u3001\u52b9\u7387\u3084\u4fe1\u983c\u6027\u304c\u4f4e\u4e0b\u3059\u308b\u3068\u3044\u3046\u554f\u984c\u304c\u3042\u308a\u307e\u3059\u3002\u7814\u7a76\u30b0\u30eb\u30fc\u30d7\u306f\u3001\u30b7\u30ea\u30b3\u30f3\u30a6\u30a7\u30fc\u30cf\u30fc\u3092\u77ed\u6642\u9593\u6c34\u4e2d\u3067\u52a0\u71b1\u3057\u305f\u5f8c\u3001\u9577\u6642\u9593\u7a7a\u6c17\u4e2d\u3067\u52a0\u71b1\u3059\u308b\u3053\u3068\u3067\u3001\u5207\u65ad\u9762\u3068\u8868\u9762\u306b\u8584\u3044\u9178\u5316\u7269\u5c64\u3092\u5f62\u6210\u3059\u308b\u3068\u3044\u3046\u7c21\u4fbf\u3067\u4f4e\u30b3\u30b9\u30c8\u306a\u6280\u8853\u3092\u63d0\u6848\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u51e6\u7406\u306b\u3088\u308a\u3001\u30a6\u30a7\u30fc\u30cf\u30fc\u306e\u54c1\u8cea\u304c\u5411\u4e0a\u3057\u3001\u7279\u306b\u5207\u65ad\u9762\u4ed8\u8fd1\u3067\u592a\u967d\u5149\u3092\u96fb\u6c17\u306b\u5909\u63db\u3059\u308b\u80fd\u529b\u304c\u9ad8\u307e\u308a\u307e\u3057\u305f\u3002\u7814\u7a76\u30b0\u30eb\u30fc\u30d7\u306f\u3001\u7c21\u5358\u306a\u30e2\u30c7\u30eb\u3092\u7528\u3044\u3066\u7d50\u679c\u3092\u5206\u6790\u3057\u307e\u3057\u305f\u3002\u5207\u65ad\u9762\u3067\u306e\u96fb\u8377\u306e\u640d\u5931\u304c\u5927\u5e45\u306b\u6e1b\u5c11\u3057\u3001\u8868\u9762\u3067\u306e\u96fb\u8377\u306e\u640d\u5931\u304c\u308f\u305a\u304b\u306b\u5897\u52a0\u3059\u308b\u3053\u3068\u3092\u898b\u51fa\u3057\u307e\u3057\u305f\u3002\u8868\u9762\u3067\u306e\u96fb\u8377\u306e\u640d\u5931\u306e\u5897\u52a0\u306f\u3001\u96fb\u754c\u8a98\u8d77\u52b9\u679c\u306b\u3088\u308b\u3082\u306e\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u9178\u5316\u7269\u5c64\u306f\u9577\u671f\u9593\u5b89\u5b9a\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

Their method is simple, low-temperature, and low-cost, and it can improve the quality of both the cut edges and the bare surfaces of crystalline silicon. This could be useful for making better photo-sensors and photovoltaic devices, but more research is needed. \u3053\u306e\u65b9\u6cd5\u306f\u3001\u7d50\u6676\u30b7\u30ea\u30b3\u30f3\u306e\u5207\u65ad\u9762\u3068\u8868\u9762\u306e\u4e21\u65b9\u306e\u54c1\u8cea\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u7c21\u4fbf\u3067\u4f4e\u6e29\u3067\u4f4e\u30b3\u30b9\u30c8\u306a\u65b9\u6cd5\u3067\u3059\u3002\u3053\u306e\u65b9\u6cd5\u306f\u3001\u9ad8\u6027\u80fd\u306a\u5149\u30bb\u30f3\u30b5\u30fc\u3084\u592a\u967d\u96fb\u6c60\u306e\u88fd\u9020\u306b\u6709\u7528\u3067\u3042\u308b\u3068\u8003\u3048\u3089\u308c\u307e\u3059\u304c\u3001\u3055\u3089\u306a\u308b\u7814\u7a76\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n

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Schematic of apparatus for a 9.35 GHz microwave transmittance measurement system for measuring \u03c4<\/em>eff<\/sub> of sample wafers with 635 nm light illumination (a). Image of experimental measurement of \u03c4<\/em>eff<\/sub> spatial distribution across the cut edge (b). Top view of the sample arrangement and definition of X<\/em>-coordinates (c).\u3000635 nm\u5149\u7167\u5c04 (a) \u3067\u8a66\u6599\u30a6\u30a8\u30cf\u306e\u03c4eff\u3092\u6e2c\u5b9a\u3059\u308b\u305f\u3081\u306e9.35 GHz\u30de\u30a4\u30af\u30ed\u6ce2\u900f\u904e\u7387\u6e2c\u5b9a\u30b7\u30b9\u30c6\u30e0\u306e\u88c5\u7f6e\u306e\u6982\u7565\u56f3\u3002\u5207\u65ad\u7aef\u3092\u6a2a\u5207\u308b\u03c4eff\u7a7a\u9593\u5206\u5e03\u306e\u5b9f\u9a13\u6e2c\u5b9a\u306e\u753b\u50cf (b) \u3002\u30b5\u30f3\u30d7\u30eb\u306e\u914d\u7f6e\u3068X\u5ea7\u6a19\u306e\u5b9a\u7fa9\u306e\u4e0a\u9762\u56f3 (c) \u3002<\/figcaption><\/figure>\n<\/div>\n\n\n

FREE ACCESS: <\/strong><\/mark><\/p>\n\n\n\n

Passivation of cut edges of crystalline silicon by heat treatment in liquid water<\/p>\n\n\n\n

Masahiko Hasumi1<\/sup>, Toshiyuki Sameshima1<\/sup> and Tomohisa Mizuno2<\/sup><\/p>\n\n\n\n

2023 The Japan Society of Applied Physics<\/p>\n\n\n\n

Japanese Journal of Applied Physics 62, SK1022 (2023)
https:\/\/doi.org\/10.35848\/1347-4065\/acc666<\/mark><\/a><\/strong><\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Passivation of cut edges of crystalline silicon by heat treatment in liquid water. 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